Why would you change anything? How the racket is during the backswing doesn't matter. What matters is whether she is accelerating through contact and hitting it cleanly. And by the fact that she's been winning tournaments, I'd say her shots are fine. If anything, wait and see if any REAL problems come up later. At this point, unless you are a super technical coach, which neither you nor any of your peers are, leave it alone.
As long as the ball is doing what it needs to do, and she isn't risking injury, everything is fine.
[K]Six.One Tour (3) 367.5 grams 31.7 cm balance.
Mains: Babolat/Wilson Natural Gut @ 23 kg // Crosses: Luxilon Alu Power Rough @ 21.5 kg