Ladies how long does it take to feel used

I have this friend that asks me to hangout or do favors for her seriously everyday. My boyfriends parents bought me a car when I already had one. I drove the car to his house one day and we got into an argument and then he took the car he gave me away and left me stranded and refused to drive me home but wanted me out of the house when I had our daughter with me. I immediately called this friend and offered her 40 bucks to drive me back home because the drive would be 30 mins and my parents were out of town that weekend. Instead she told me to fill up her gas tank and I did but it was about $40 to fill up anyways. Ever since that day she's been asking favors like multiple times a day like "hey can you drive me here" or "hey can I borrow money" I mostly always do these favors because I'm grateful she helped me out when I didn't have anybody around. I feel like she asks for too many of them though. When we do hangout its just me driving her around to run her errands like a chaufeer. When I tell her no she makes up sob stories like her son has no formula or diapers and makes me feel bad about it or says she's lonely and makes me drag my daughter out. Before when I was pregnant I was working a long shift at work and got out at 11pm. She asked me to come over because she was depressed and sleep deprived as a new mother. I went over there to help her out and she handed me her child to take care of while her and her boyfriend were getting drunk and high in front of me. I was taking care of her baby who was crying for her while she competed ignored him. I was so tired myself and stayed till the baby fell asleep for at least 30 minutes because god forbid the baby needed something both of her parents would of been super drunk. I've done alot for her. I've taken her and her boyfriend camping 2 hours way and paid for everything. When we go out to eat she tries to get me to pay for her and her boyfriends meal when it was there idea to go out to eat. I don't think we've ever hung out without her asking a favor and I've constantly done it but lately I've been saying no because I'm tired of doing everything to benefit her constantly. I never met such a needy person in my entire life. Also when she had her baby shower my dumbass spoiled her with gifts so now she keeps telling me to come to her sons first birthday this upcoming month and I feel like she's being very annoying lately because she wants me to buy her son a nice gift like I did for her shower? I must mention she doesn't want to hangout if it doesn't benefit her. Not sure but am I being too hard on her for feeling this way? she never takes no for an answer because then she starts making me feel bad. I'm use to letting people walk all over me and having people that are toxic is a big no for me for this reason. Is this a toxic person I should drop? Or am I crazy and should just not think of it this way? Please advice needed! Also if you read this whole thing, thank you so much.