Push causes travel?

[mplagrow]

Eighth grade girls' game. A1 grabs a defensive rebound and waits for the lane to clear. Meanwhile, B1 turns to head downcourt and bumps into A1, who is still holding the ball. I don't feel that the bump is enough to warrant a call, but A1 was slightly off balance. She almost regains balance, but stumbles forward and loses footing. Now it looks like a travel, but it was caused by the initial bump. So I got:

A) a pushing foul by B and a late whistle

B) a travel by A

or

C) no call

Maybe you had to see it, but I bet other guys have had similar ones. I had no call, and coach starts yelling for travel. I said, 'Yeah, but your girl pushed her,' but then it sounds weak because I didn't call it. I don't think he would've appreciated a late foul whistle either. Anyone else?