I give your DD a ton of credit for realizing that having a full time job at 12 years old is nuts and these are years she will never get back. I give you of credit for listening to her as there are some softball parenting idiots that post on this board about forcing their kids to play when that clearly isn't their wish. I had one that quit voluntarily and one that was injured. The one that quit voluntarily sometimes thinks about what may have been. I injured my other one by pitching her too often when she was younger. She kept playing for years just to please me. She's had multiple issues in life, many of them medical in nature. I ended up losing her.......I don't know where she is or even if she is OK. The bottom line is that she didn't believe that she had the ability to tell me she wanted to quit. She thought it would hurt our relationship......and it did. We didn't spend nearly the amount of time together and she suffered because of that.
I would recommend only that you embrace her new endeavors and spend as much time as you can with her. The likelihood is that she knows how her quitting has affected you and she doesn't want you to hold it against her. My DD's perception is that I held it against her, which I didn't, but her perception is her reality.
If I could do it over, I wouldn' t allow her to play travel until she was an older 12U player at the earliest. I would limit her pitching, practices, and lessons. I would encourage her to play other sports. This is a list of everything I did wrong. Don't be like me.