OP at the end of the day she needs to enjoy her football, and if she’s not, she should leave. Ignore all the people saying she’s being a brat. They clearly don’t understand how it works for goalkeepers.
All players accept that they can’t guarantee they’ll stay on the pitch for the whole game, but outfielders have the option to work on their skills and get as much game time as possible. It doesn’t work like that for goalies, and there’s no fun or challenge when you already know that every week you’ll only get half a game.
I had a similar situation with my son. He’d played in goal for a team for 10 years, he was captain, he recruited many of the players, he supported the team, they’d always call him after a game if they felt they’d not played well and wanted to talk it through. He had been asked to join numerous teams over the years, but was loyal to his original team, missing just one game in a decade. Then one day the coach brought in a new goalie, on the grounds that “competition is always good”. It was such a kick in the teeth, after years of commitment. He lost the love for the club overnight, and moved to a new team. The new goalie didn’t stay, morale dropped, and the team folded within a few weeks. I’m not saying that my son leaving caused the team to collapse, but football teams are very delicate things, and it’s often a mistake to try and shake things up too much.