How do I tell Them I don’t want to Babysit Anymore? (part 3)

hey guys I’ve made two other posts and I’m here to say i did it(it beinf telling my sister i am no longer watching her kid every Saturday for free from 4-10p.m), I sent a large text that I will supply here:

watching (redacted) has put a wedge between us, but not because of (redacted), I’ve been trying to sort it out for months now but it’s always not a good time for you guys.. family things and bills etc.
I’ve felt repetitively ignored when requesting things…. I never ever wanted to work weekends but agreed with the condition that if I need my saturday free I would get that, also the time on saturdays I had originally agreed to be 2-4/6 and it migrated to 4/5-10 at some point and i didn’t mind that but again when requesting something you have completely lost it on me…. I’ve been made to feel like I have to do this and have no other choice because you can’t trust anyone. I find it hard to believe that you haven’t noticed how unhappy many of these decisions have made me. I do become distant when I haven’t been listened to…..additionally the payment situation, I was clear that I didn’t expect to be paid everytime cus I understand how it is but the amount of time I was watching him without pay is a little ridiculous, I rlly didn’t expect much and I’ve felt really pushed around for months, I haven’t brought anything up because as I said before I’ve gotten responses from you that I wouldn’t have even imagined? so I do shut down, I am upset that we litterly haven’t talked in months and it’s because I have all these negative feelings about not being heard/being stuck in this situation with no choice. I know you will say I had a choice but please go and look at how you have texted me since the beginning of this when you felt I was retaliating against what you wanted. I remember directly telling you I didn’t want to work friday/sat and you made the white people Muppet face at me and sent a schedule that litterly was those days……. im 22, everything i want to do is on friday/saturday. Not to mention how unrealistic it was for me with pretty much 0 work experience and no license to tell employers I can’t work those days……. I understand you have a family you need to care for and support but I need to be able to support myself aswell.

—(end message)

I got a job and she had started texting me questioning me on things and it all poured out. she took a few hours to respond and I’m not going to open it because all it was is her being angry and saying “look at how you talked to me! and you never gave me notice for those saturdays!” the no notice she is referring to was me asking the day before if she could have someone watch him for a few hours while I helped a friend move, and the second time was when I had a huge infection on my face and needed him to be picked up early because it would swell at night. and both those times I STILL watched him and she was a huge bitch to me about it, she would often make me feel guilty for asking anyways? saying “oh….. I guess I have to take that night off”…. I’ve always been really nice to her in text and in person almost gentle parenting her to the point she said “i always freak out on you but ur so calm! I always feel crazy after!”
im just really said that everything has come to this, we used to be really close and I never would have thought she would completely brush over how I felt just to make herself comfortable with how her child was cared for. that is all and thanks so much! I’d love advice from parents about how to reconnect with her after this….if you guys think she will chill out ?