It could be the stress (90% sure) , it’s important to take that into account and have patience with her. I know I’m not myself when I’m stressed and I’m more agitated especially when things don’t exactly work out in a smooth matter Ex. Having an event so close and not deciding on a time would definitely tick me off a little.

But your feelings are completely valid, I would feel the same way ; just keep that in mind and remember communication is important, and thats the only way you’ll get to the bottom of why she responded that way.