My mother does live cam shows and it really bothers me.
What about it bothers you?
It's totally gross and my girlfriend is starting to think she should try it too.
It may not be what you like both it's how your mom decides to make money. She and anyone else can make money how they see fit as long as its legal and if you're girlfriend wants to do it too you just have to accept it or move on. Hopefully you can be adult enough to not let it affect you.
I don't agree since you say to just let it go and it's not going to happen.
I understand that it can be hurtful for the women in your lives to do such things, but it is still their body and decisions. I believe you should encourage them instead, and they can teach you that it's not a bad profession.