So she's either got pissy about it and given the cold shoulder, or she's queuing them up and can't move a booking by 10 mins. Assuming it was a 30 min booking, that would mean shunting the next one or risking an overlap, and i guess most wouldn't want to go down to a 15 min booking.
Either way, not a great set of circumstances.
I was going to see her this evening but i was having second thoughts anyway for a couple of reasons so might avoid altogether.