As I can remember - in the past they "advised" the parents about DF children.
Now they have an example, where the child has to shun the parents. This is new for me.
So it seems true, that a lot of the older people are leaving the WT.
Another point:
Before writing, she reviewed Bible principles
Not bible laws - "only principles".
Bible principles = biblical exegesis (man made rules)
§ 14: Urge your friend or relative to seek the help of the elders. If he or she does not do so within a reasonable period of time, loyalty to God should move you to report the matter to the elders.
Maybe Anne has told the elders about her mothers "wrongdoings".