Second Time Jitters?

I took Grace to the dentist for the first time last Fall. She did amazingly well, and didn't show any signs of being scared. We talked a lot about it beforehand so she knew what to expect, and she actually seemed to enjoy the experience.
Today was her second appointment. I mentioned it last night and her immediate reaction was "No! I don't want to go to the dentist!" I was surprised, and even after we talked more about it and chatted about her last visit, she still did not want to go. This morning, she was near tears at the thought of going. I told her that if she did well at the dentist, we would stop at the store on the way home and she could pick out one thing (yes, I bribed her. Probably not the smartest idea, but ... whatever). Brian was going to take her but she insisted that I do it. As soon as we got in the van, she was fine. We ended up waiting for over half an hour (even though we were there on time) but Grace was content to sit at the little desk in the waiting room and color, and played with Lego for a while. She did great while the dental hygienist counted and cleaned her teeth. She didn't want to wait for the dentist to come do his check; she couldn't wait to get back to the "living room" to finish her coloring. The hygienist was so sweet and went out to get the coloring book and crayons and brought them in so Grace could color in the big chair while we waited for the dentist. All in all, another successful visit!
We stopped at the store on the way home and Grace picked out a little tiara/earrings/necklace set. Two dollars well spent!