Families & Friends of Gays & Lesbians Support Group
This community is dedicated to parents, siblings, grandparents, other relatives and friends of someone who is either gay, lesbian, bisexual, transgender or questioning their sexual orientation. The purpose of this community is to help families and friendships grow and maintain positive relationships with gay sons, daughters, family or friends.
I can only answer your question from the pov of a straight father, so take this forward it's worth. I grew up with some of that traditional view, but when my son came out, it put my views in conflict with reality.
I began to question the teachings about hell. This was not a quick process, but it was an important one. The eventual conclusion for me was this: I don't know. That said, I was sure of one thing - I love my son. The only time we have for certain is our time here on earth, and I refuse to squander that time pondering the afterlife. That's God's domain. Hopefully your mom will come to a similar place on her own. Be patient with her until she does.