Time will tell how it works out with your mum. I will write a little of my experience as it may be useful - it is abbreviated but these basically are the facts as they played out.
I stayed with my mother for a couple of months after my father's death, until one day the locks were changed while I was at work.
The elder who was (supposedly) executor of the will and one other came to the house and found a safe that had held a substantial amount of money had been cleared out. They immediately decided I had taken the money so changed the locks and installed a "watchdog" sister. After doing so they called another relative and found out that the money had been deposited in a term deposit at the bank (I did that) but my mother had forgotten. I called Elder A and he squirmed and tried to avoid the issue but said my father wanted him to look after his financial affairs as he couldn't trust my husband (or me). My father had no reason whatsoever to say that and I'm not sure he ever did. The elders revoked my Enduring Power of Attorney the previous day, and elder A's account of that differed from that of the bank manager's. My mother was obviously in no mental state to instigate that change and when she tried to tell me about what had transpired at the bank was not in any way coherent in doing so. Elder A made some pathetic statements about why he tought she understood.
During this time I saw my mother's doctor and got a referral to a geriatrician - concerned she could have had a slight stroke as her mental capacity was declining. I gave this to the live-in sister but the elders later claimed they never got it - for good reason. The sister moved out after a couple of weeks and my mother was left alone. She wandered the streets and was brought home by a truck driver late one night after getting lost. I contacted the Office of the Adult Guardian and wrote all details that they then investigated. It has progressed to the highest level of investigation but no outcome as yet. They are extremely slow.
After the investigation started and a number of other visits from community care workers etc. elder A and B returned en force and took over management of all her affairs. This at least saved her life as she was at the point of hospitalisation or worse due to weight loss. At this time I could barely get past the front door (she is a follower not a thinker). After all financial affairs were in order they did see the geriatricain who stated that she was now unable to handle her financial affairs. They claimed at first they did not accuse me of stealing her money but later admitted in a round about way they had thought so.
Her house (which will become the societiy's and which she and my father would never have had if I had not organised it after 1975 was a fizzer) is now having rooms added for someone to live-in.I was told this is necessary as my potential plans (with her acceptance) to take care of her would not have taken her spiritual needs into account.
Elder B acknowledged poor behaviour due to misunderstanding and arranged a meeting with A, B me and my daughter. All I can say is that if I were still in any way inclined to believe in the honesty, ethics or spiritual conscience of the elders/WT, that meeting would have finished it. Elder B made an effort to appear contrite while supporting elder A. Elder A simply behaved as any 'legal' person would and said as little as possible apart from his opening words of "I believe there are some things you don't understand and would like us to clear up." His last words were, "we will continue to administer your mother's affairs'.
I emailed my response of that meeting to them but no reply. When my daughter asked elder A how he would feel if he were in our shoes - being disenfranchised of your family, he did not answer. That man is as cold as they come. I have seen a lawyer who was quite disgusted at their behaviour, although I know it is not generated from them per se. He told me I can contest the will, but that has never been my objective as I tried to explain to A and B - but they seem unable to grasp that. My request is simply that I be one of (the third) part of the Enduring Power of Attorney to monitor what happens to her should either of these two people default on their responsibilities. Interestingly, when my daughter asked elder A that question he said -"Well, she will become a ward of the state." How can one communicate/negotiate with a person who thinks like that? And who is this elder? A previous Australian branch overseer.
There are many other twists and turn to this story that still leave me (and other people whom I have told) open-mouthed with astonishment. The one positive outcome is that involvement by the AGO probably saved her life, so I guess it is there my responsibilities rest. She barely speaks to me now as my father is not there as some kind of voice of reason. I guess it is her journey.
As I was unprepared for this situation (although intuition told me something) this account may be of help tp someone else with the same circumstances.