Women Bronze vault has turned into a roll

[Dream]

My DD had a nice straight back flip when doing "vault" for the past 3 years. I say "vault" because it was the bronze vault where basically they jump on the springboard and then flip onto the mat but it was very good. Now this year she is folding in the middle or just straight out doing a roll. I will not try to fix it but would like to understand is this a normal stage of progression or what os happening?

 

[Pineapple_Lump]

I would assume her run has changed (she is probably bigger and faster) and her hurdle is now too close to the board.