Your DD will run into similar situations later in life, not just in softball. This is a good opportunity for you to help her navigate these sorts of issues for the future (and again, not just on a new SB team). Parents/coaches that try to pave the way for their kids the way you describe are ultimately preparing them to fail. The question is whether you want to be around to enable that behavior or move on and find a better situation that fits what your DD needs.
Keep in mind however, that if your DD is 13/14, at this point these decisions should be more about what she wants, not what you want for her. If she is perfectly happy on this team and is oblivious to the shenanigans that are going on, why move her? Given that you have already lost a few players, I'm sure she is not oblivious, and knows what is going on. Talk to her about what she wants to do, and prepare her to understand that jumping to another team could be better, but may not necessarily be better. She may have to work twice as hard for half the playing time if the new team is much better. The grass is not always greener, but her current situation is unbearable to her, then a move would be appropriate. Good Luck!
Great advice!