I'm so sorry you're having such a hard time. Your t having all this family drama in her life must be so frustrating for you and her. Hopefully you guys can talk sometime this week, and maybe after the holidays things will slow down. We can only hope for that.
When you talk to her, please let her know about the SI and wanting to kill yourself and feeling invisible. All of this would be easier if you had her there face to face. Does she have any idea when she's coming home?
I'm sorry about your husband too, and your friends not calling and stuff. Just know you're not invisible on PC and we're all here for you.