This is the one she can get her tongue over
This is one she can't
You might want to go to one with less tongue relief or tighten your headstall.
I just kept checking Vida during a ride. If she was still getting her tongue over I'd go up another hole on the headstall. I felt terrible to keep tightening it up but after she got used to it and stopped playing, I could move it down to just in the corners, no wrinkles.