HI
@Robert59
This entire time period has been very difficult for you.
I am very sorry, you have these difficulties.
I don't want to write out the specifics from your posts over the past year or two,
but I do remember...
there were lots of extreme difficulties when she was living with you,
and all of her different medical issues were becoming very hard for you to try to find ways to deal with.
All her illnesses, have gotten worse, and are getting worse now, and they
will continue to get worse.
I don't see how you could take care of her, so I don't think it's a good for her ( or for you)
to have her come back to your house.
It would be nearly impossible for most anyone to continue to take care of her at home.
You also have some serious medical issues, yourself,
that she will not be able to help you with, at all,
and your illnesses also will make it impossible for you to take good care of her, and will make it too hard for you to take of yourself at the same time, while trying to watch her. It would be very difficult for anyone.
I understand how attached you are to her, and that you do care about her, and that you don't want to live alone either.
That is all hard, but I think it would get much worse for you, and for her too, if you try to do it again, when she is getting worse.
Remember that her sister did not communicate well with you, back when you and your girlfriend needed more help.
And her sister did not help with her care, in any way, when the girlfriend lived at your house.
You had no one else to help take care of your girlfriend, then. And it seems certain to get even more difficult and impossible.
It is better to let her relative deal with where she lives now, I am sorry it is this way, but everything looks that way.