My mom is moving in with me & my husband. We need all advice on our taxes, mom paying rent, etc.

My husband & I are in the process of moving my 86 yr. old mother into our home. She is currently in rehab for a fractured hip. She was living in independent living in a Senior Community, but after her 3rd and final fall since living alone she asked to live with us. We love her immensely and both of us are welcoming her and want to make her comfortable and at home. What we weren't aware of is how this will affect our yearly income tax and her Medicaid if she should should ever get to that point. I am her FPOA and Health POA. She wants to add my name onto her bank accounts. We want to do everything legally and the right way. I work 3 days a week and will be her caregiver the rest of the time. My mom insists on paying me for her caregiving, just as she will a caregiver when we're at work. She wants to pay rent and to contribute to our household bills. I didn't want to do this....she's my mom!!!! However, people have told me it's in her best interest, financially, and ours. We just need to document everything from caregiving, what I do for her and when.....and all purchases and receipts for rent, etc. I need to know what I need to do and what I do not need to worry about. I never thought all of this was involved! As I said, we want to do this the correct way. I apologize for the length of this, but we are new to all of this and would welcome any and all advice. Thank you and God bless!