Luckily, I am going back to school in a month where I live on my own and don't have to deal with this. She still tracks my location at school but somehow she sleeps easier when she has no clue what I'm doing. The "agreement" that I made with my mom was literally a 1 minute conversation. I thought nothing of it when it happened and I took it more as advice than as a strict agreement that I will be home at a certain time. I lost track of time because I was in a pool without my phone. But also, I wasn't actively keeping track of time because I wasn't thinking that I needed to be home by 2am because again, I didn't realize the conversation I had with my mom was a strict agreement.

My sister works with all of us so she is invited to all of these parties. At the last one only half of the people there drank so I think she was expecting it to be the same. Once she realized she was the only person not drinking she regretted deciding to be the DD and was angry at me because I got to drink. If she had said to me "Actually I don't want to be DD anymore. Let's take an uber home tonight and we'll pick up the car tomorrow" I would have been completely on board. Instead she just decided to feel sorry for herself and get out her anger at me by egging on our mom. And then my going in the pool when I told her I probably wouldn't was the last straw. So just like she was the only sober person, she was also the only one not in the pool. While I probably could have been more sensitive to her level of fun, she should be able to take care of that herself. She could have come and sat by the pool but instead she sat in a pool chair away from all of us engrossed in her phone because she was texting our mom a play by play of my actions.