What do they do at 9 month check up? My daughter's appt. was SUPPOSED to be today but they called and said it isn't…

What do they do at 9 month check up? My daughter's appt. was SUPPOSED to be today but they called and said it isn't until tomorrow, I don't have a way to get her there because her daddy works all week except Tuesday and he uses the car. I know damn well the appt. was made for today because I put it in my phone as it was read back to me and I ALWAYS make appts. on Tuesday due to her daddy's work schedule. This is the 2nd time this has happened and I'm just so annoyed with her doctor's office. They have one good doctor so I had to reschedule her 9 month check up for next month and I'm worried that's just going to put her behind.