This same situation happened to me.
I got her a Tropical Storm and she did pretty well with it for a little while. It actually hooked more than I thought it would, at first.
The problem though, it burned out very quickly to the point now I can't even get it to hook. We cleaned it, scuffed it, nothing.
Like a lot of women starting out, they don't have a large amount of revs on their ball, my wife has about 6-10 on hers.
You might not think of doing this, but I would recommend a stronger ball, I got her a Special Agent and she loves it. No she isn't averaging 220, but now when she throws a good ball, it moves in the backend and smashes the pocket.
That's my recommendation.