If you can show the account with the savings in, over the same period you had the overdraft and explain the reason why you went O/D I would expect the ECO would see some sense.
As you may be aware you just have to prove she will return at the end of the holiday, and just having a flight back isn't enough.
Get all your docs in place and allow a bit longe because the Olympics are tking the Immigration dept up quite a bit now so it may be prudent to consider that.
Good luck with it.
Tone
