Dej,
All I can say is to follow your gut instinct.

So many of us have dysfunctional families like you. A couple of months ago, my sister got very ill and was in the hospital in horrible pain. We've had an on again, off again relationship over the years...
Anyway, her daughter contacted me, as well as her DIL, and told me she was dying...that if I wanted to see her, I should drive over.

She lives about 350-400 miles away, so DH and I got in the car and drove there...I wanted to hug her, tell her I loved her and say goodbye.

Needless to say, she was NOT dying...but really appreciated that I drove over and saw her.
She's home now and weak, but it's difficult to talk to her because she is such an energy vampire...I feel so drained after I hang up...so I haven't been so good about calling (she NEVER calls me). By the way, she is my older sister, my only sibling.

I'm still glad I went to see her. I try my best to avoid all of the dysfunctional drama that comes with her family...but I also try to stay in touch...she's the only family I have left, and I really don't think she'll be around long term.

So, my dear, you need to do what you feel will be best for YOU. If you think you'll have regrets about not going, then go. If you feel it is in your best interests, both physically and mentally, to stay home and send a quiet prayer her way, then do that.
If you are not received warmly, can you handle it? Are you thinking of going there in order to heal your wounds, no matter what happens?

These are things to think through. Either way, you will make the decision that is right for you...
our thoughts and prayers are with you, dear