"Back of glove". Keep the glove closed and catch with the back of it. Girl is forced to use her throwing hand to trap the ball and transfer is automatic. Same as pancake but no extra equipment needed
Caution: if a girl is not used to it, it's easy to stick the throwing hand in the way and get it smashed. Make sure she lets the ball hit the leather first and then traps it. Even if she's never done it before, she'll pick it up within 3 or 4 reps and its off to the races!
If you want to speed up the transfer, this would be my #1 suggestion!