The good point of it was that we had the debate with her elders in back of the kingdom hall with all of the old books
No that is the bad point. You were on their turf and outnumbered. They now know you are a nasty old poztate because you don't believe every thing that they say.
You are in a no win situation when you allow this to happen and I see in fact the conclusion was reached you are a poztate.
I feel sorry for your situation but nothing will change except "mom" will be encouraged by the elders to take a harder line with you as regards shunning.