I honeslty think her taking b will do you more good

You will be free from abuse in your own home, SHE will miss her home and wonder what YOU are up to...

You have to assess those two... you can hope she will give you c :

c. Let her life with you platonically for an indefinite amount of time

But then you have to trust her... You have to TRUST that she wont' turn c into a behind your BACK.