Live in but not related

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wanderoutdoors
Live in but not related

I live with a friend who requires almost around the clock care (not quite).  I work a normal full time job and thought it was a good idea to pick up some extra money working a few hours caring for her.  She has someone Mon-Fri days and  I am scheduled 5:30 to 7:30 pm Mon - Thurs.  Off Friday night, Sat and Sun scheduled 7:30am to 3:30pm.  I am having a hard time keeping firm boundaries, she seems to think I am available anytime. I enjoy caretaking but I get up at 4:00am during the week for work and really need to be completely done at 7:30 to shower and go to bed.  On the weekend, she consistently asks for things to be done well past 3:30 and is very manipulative.  We have had a conversation about me needing to attend to household chores etc and try to still have a social life but we are still struggling. When she requests things, would just flat out saying no I cannot, Im off right now be rude or inconsiderate?   We have talked about this but since it's not working well I think we need to try a new tactic.  Looking for input, advice or experience.  Thank you!