problems with family often aren't a quick fix, so you'll have to hang in there. Sorry to hear it is tough. I am confident your prayers are being heard, and things are in motion....
Make sure you replenish your energies regularly. Pray for it, and connect to healthy Earth energies, i.e. grounding. And pray for her, ask that she gets Love and Energy from the Divine, so she does not have to take it from you! Or less so over time.....
If you have not already - look into cord cutting, and relationship healing prayers/ visualizations.
I keep on reading on here too, that others seem to be helped keeping rock salt in the house, or bedroom. Either dry or in thick water solution. Just make sure you throw it out once in a while, and do not cook with it, after it has potentially absorbed negative energies.
Make sure you eat healthy, get probiotics, and possibly supplement Vit D
Love and Light! Saying a prayer for your situation too!