Hi Elysium,
I was in a similar situation a few months back when my husband had open-heart surgery. I stayed with an acquaintance from my former church, so I could be close to the hospital and visit often.
This lady's house was beautifully decorated, and she kept everything just so. Even though I had the whole downstairs to myself, it felt strange. I was glad to get home.
You can just say to the lady in your situation, that you are sorry for any inconvenience this has caused her, but you have discovered that you need to be in your own place.
EJ