Caring for Grandma. Can she pay me to be her primary caregiver?

My 86 year-old grandmother moved in with us last July. She had been diagnosed with dementia/Alzheimer's as well as bipolar disorder. I gave up my job to be able to stay home with her since doctors said she should no longer live alone. Of course this has left us financially unstable. We live in Mississippi. My grandmother has some money in the bank. Is it allowable for her to pay me since I am her primary caregiver as well as POA? I do EVERYTHING for her.