Hi toxic,
I too cut my family off. Similar sort of thing to your story.
My advice is....be brave and then don't be afraid to lose things. Think to yourself, lets see if she really loves me, and if not, then she can go away.
So, say no to the money. See what she does then. Will she be horrible to you? Or will she suddenly start valuing you as her sister?
If you are too scared to force this issue, then it will carry on.
I let it carry on until I could do that no longer, and then I called them out and they said no to me, and so I said goodbye to them.
It has been a change in the hurt. No more upsets from them. But I won't deny that it hurts to be alone in the world with no one who is family to you. But that hurts less than faking family to myself when they are not truly there.
Have courage. When you stop the new hurts from new incidents, healing begins.
Here are some othe tips.
Get support for yourself when you feel bad. Know where you can go and who will listen.
Get outside and get into life. Do not hide away.
Expect high standards of yourself, do what you know to be right, do the things that need doing.
Develop ways to comfort yourself that do not hurt you.
But mostly, let the bad decrease and the good increase. And that starts by making yourself safe from further abuse, say no to your sister and then see what sort of person she is.
Hugs xx