Don't beat yourself up - I can remember grumbling at Humphrey once because he was pestering me and he'd needed to go out! I felt terrible at the time but it was all soon forgotton.
If we're travelling, I do try not to feed him immediately beforehand but if it can't be avoided, (we recently had to set off at 6 am and it was a 12 hour drive) than rather than let him travel hungry, I just give him a very small portion and then top him up along the way.
But you can't always plan ahead, these things happen, I'm sure she's forgiven you!!
