I didn't walk in my master's ceremony either. I had already had high school, BS in college and another BS from a medical program. I didn't figure my family (or I) needed to sit through another one. However, one of my coworkers who didn't graduate from college ( just the medical field) did walk so her family could be there and watch.
Your daughter may truly not mind if you aren't there, but if you were able to swing it, I'm sure she wouldn't mind feeling special for the day, you know?
Jodie