There are only a few top flight brands / bats to choose from. The performance is all going to be similar. Power carbon from @CoreSoftball20 $ to performance cannot be beaten. However she is 11, let her tell you which one she wants that will make her happiest.
It is also illegal to remove anything!!! While this example if MLB, I think it falls under the same area of interest. Bruce Sutter used to rub one side of the ball on his Jersey. MLB forced him to stop doing that.
My DD's coach uses a tarp. Pretty much the same thing as a back stop but maybe a little safer on the ricochet . She used it more often in he beginning, but still breaks it out once in a while for specific drills.
unfortunately, this is just part of the game. Move to the other side of the mound. If this is your home field, you could put in mound bricks across the landing area and that will fix the issue.
There are other brands but here is an example...