I help my neighbor who has dementia, because I have years of medical experience. I feel like her family taking advantage of this and using me as her caregiver. What should I do?

field.however, i had a car wreck and i now have seizures. they visit her 2x per week. she can not read and does not understand numbers. she can not cook nor dial the phone.she can not even pick out her own clothing. she was under my foot all the time. it was like we were attached at the hip. when i did this for a living i made over $1500.00 a week. i have feed her all the time as she can not cook or even use a can opener. done every thing except wipe her but and give her a shower. she was asking me to do all of this and much more. it got to the point that i had to put a sign on my door," if you have called me and are expected please knock otherwise please leave me alone.thank you" can you please help me???????? i am getting no where with her family nor senior advocate. thank you so very much