My 73 year old mother is still Episcopalian. She is a very moral person and is heart broken over what has become of her church.
That said, my husband and I left when our children were young.
The hand writing was on the wall and we decided it was not the place to raise children. It was very difficult for me to leave as I loved the church. We were blessed to find and attend a Continuing Anglican Church, 1928 prayerbook.
I attended Episcopalian church often as a kid but today I wouldn't go to one.
As for your mom I think it's like Southern blue dog democrats. Even though the party is completely foreign to their way of thinking, they stay with the party cause their pappas, grand pappas etc. have always voted dem.