My sister is being petty

AN

So yesterday we went trick or treating and a lady gave out squishmellows (plushies) and my daughter(5y/o) ended up switching the one she got that my niece got. My sister got upset. And I didn’t even know she was upset. My niece is about a year and a half. But my sister had an attitude and I didn’t know why. Until my mom told me and I told my mom she needs to grow tf up. My niece didn’t cry about it. Now I talked to my daughter about it and asked her why she did it and she said cause I wanted that color. I told her don’t do that because it not ok. But then my sister texts me if she can have it back and switch. Lately my sister has been petty and acts like a kid.

Maybe I just annoyed with my sister because of how she is handling her life. She recently became a single mom but wants everyone to cater to her. She hasn’t got a job she applied to be a care giver for my grandma but I know it will not last. I have told my mom instead of her going out she needs to get a job and my mom sticks up for her and says well she’s not catching the bus with a baby. I feel like she thinks everyone will cater to her. She had asked me to watch her child while she has “alone time” and I told her no and she got upset. Again at the end of the day going out should not be a priority a job should and taking care of your child.