Would you feel betrayed and upset?

So my brother is married and has been for 5 years plus an additional 10 years of dating. So my SIL and I have been pretty close. I'm a mom of 2 kids with my youngest being only 4 months old. When I was pregnant with my first she was always there telling me how everything will be ok and that I'd be a good mom and even helped me try to get labor going by doing pressure points and stuff. She was always there for me to talk to when I had my son and needed advice. When I got pregnant with my second when my son was 8 months old she was there for me throughout the whole thing once I came out with my second pregnancy. She assured me that even though its hard, it will be fine and that I'd adjusts to having 2 kids, especially so close in age. We were so close during my second pregnancy. She was honestly the best sister I've ever had. And I have real sisters so that's saying a lot. Even before having kids we were always close. My SO wasn't able to leave work to get to the hospital when I was in labor with my daughter and missed her birth. My labor was so fast that an hour after getting to the hospital and finding out I was 8 cm dilated and 5 minutes of pushing, my daughter was born. My SIL was there for the whole thing.. She drove me there, helped me get dressed in my gown, through getting hooked up to the monitor, all my labor pain, anxiety when finding out I'd have to deliver naturally with no pain meds at all, all my panic, contacting everyone who needed to be called, me delivering my daughter, and she even cut my daughters umbilical cord. My mom couldn't be there in time so she was there as my support system 100%.... Recently my SO and I have been going through some relationship issues and I have been able to talk to her and vent. I'd be able to call her or message her whenever. Well recently she has been acting out instead of being civil with my brother(since they're now getting divorced) and I've been caught in the crossfire. I babysat recently and she decided it wasn't her problem to pay me even though I watched my niece for her during her week of having the kids. And now says she doesn't want me watching the kids for my brother during his week. Acting like she doesn't trust me with her kids. I'm feeling betrayed and upset by this. She and I have bonded so much. On a level of her being a huge part of my daughters birth.. That's a huge deal for me. She's even told me she has a special connection to my daughter and I just felt so happy that her being there to see her born was special for her as well. It was the only vaginal birth she's ever experienced(she had c sections both times)

Do you think I have a vaild reason to be feeling so hurt? I've cried over this .

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