OK... I read all your posts PM, now I have to comment. My daughter went through the same thing 3 times and she survived. The first time was in travel ball. Another player had the number she liked. Notice!!! I did not say "Her" number!!! She chose another. Her freshmen year in HS was the same situation. After that she had her favorite number the final 3 years. The EXCAT same thing happened in college. A senior had the number she liked. She chose another. She then had her favorite number for the next three years.
EVERY organization my daughter has ever played for handled the numbers situation the same way. The player with the most years in the ORGANIZATION got the option of retaining or giving up their current number. If both players had the same number of years the older player got to choose. Tie breaker was a coin flip.
Bottom line is this. THE NUMBER DOES NOT BELONG TO YOUR DAUGHTER!!!!!!!!!!!!!! It belongs to the organization. If your daughter played for any of the organizations mine did they would have showed her the door if she came up with that kind of non-sense over a jersey number. This is a case of you needing to step in as a parent and tell her to quit whining about "HER" number and choose another.
I saw a very similar situation in HS. There was senior who was upset a sophomore was starting and playing "HER" position. The sophomore was worlds ahead of senior in every facet of the game. The coach told to her in no uncertain terms the postion was not "hers" she had to earn the right to play it. The senior played in a handful of meaningless games and was the biggest PITA imaginable for the rest of the season.
The organization comes first, then the team, then the player. If you or your daughter can't understand that you need to start a DDT and then you can rule your own little universe.
Last thing.. My daughter was the number one pitcher in all of those situations. She never once complained about having to change numbers. It has noting to do with money or any of the other non-sense you cited. It's about seniority and order.