You've got a lovely looking lady there..
Anyhow, I've never re-potted during flowering, but if it's done safely and carefully, I don't see any problem in it.. I don't really think it should make much of a difference what phase the plant is in (please correct me if I am wrong people), but it's absolutely important that you don't disturb the roots much or else it could be shocked (as it could in any phase).
Oh, and I guess one thing to think of is that if you re-pot it, I'd suggest using a nearly identical soil mixture, because you don't want to drastically throw the plant into a new nutritional diet that quickly, or even that could shock it.