She was worried a Prince would try to marry her.....
Long story--we went to story time at the library the other day. The theme was Knights, so the Prince of the local renaissance faire was there with the Court Librarian and Master of Arms to talk about Knights and read a story. The Prince saw DD and said something about not knowing there was a Princess attending (she was dressed up) and she hid behind me. After he left, I talked to 3yoDD to figure out what was wrong. You see, she figured that with him being a Prince, and her being a princess, obviously he would want to marry her. She very seriously told me that she's "a little girl, and he has to marry a big, grown up Princess." and that she, (my 3 year old! daughter) is going to marry her true love.
It gets better...you see, we've met this Prince before, and my 5yo son thinks he's the bee's knees. Serious hero worship. So he wanted to talk to/take pictures with the Prince. But DD didn't want to talk to him until I agreed to explain that he can't marry her. I nearly bit a hole in my cheek trying to keep a straight face. He was awesome, stayed in character, praised her for her wisdom and asked if they could be friends. Adorable, right?
2 days later she's still talking about it. She's not getting married, even if the Prince cries and cries and cries. She's brought it up about a dozen times!