If you can afford the current school, keep her there. Period. It sounds like she’s doing well and established herself there. This will all help when applying to med school. There are posts on here about student’s transferring to their #1 choice and actually not doing well for many reasons. Especially for med school her connections she’s made will work in her favor.
My daughter transferred in her Junior year also. But took a sorta gap year. It was the right move for her in many ways.
There is nothing you have said that would convince me moving her would be the wise move. If it’s financial then do what is needed. Also would all of her credits transfer cleanly? Don’t make assumptions since many don’t.