Is there any way you could sneak into town, see your mother, and sneak out before anybody even knew you were there? I know first hand all about toxic family members, and I really feel for you. When my mother was dying and in the ICU I used to visit her every day in the wee hours of the morning just so I didn't have to deal with any relatives. To this day they all think I didn't visit her at all, but I could care less what they think.

Your number one job is to take the best care of yourself. If this means staying away from toxic people, that's what you have to do.