It shouldnt matter if you're upset or the happiest person on the face of the earth. She shouldn't be snippy or unresponsive or anything other than the most helpful she can be. If she cant schedule a time to take you to see these houses, then she should have someone she works with fill in for her when she can't be there personally.
Customer service (or lack of it) is really one of my pet peeves and bad service I have little to no patience for....on a good day!!