Thanks everyone for the input. After reading about all of your brave kids I think if she makes the height I'll let her ride.
Miller1412, I'll be getting dirty looks too, but it will be from my own parents, LOL. My mom couldn't believe we let my DD8 who was 5 at the time ride it(Funny story, we were trying to see Beauty and the Beast, but it was closed that day. We were standing around looking bummed and a ToT CM saw us and asked if we would like to ride ToT. I was pregnant so I couldn't, but DH & DD said yes and so she took them to the front of the line, speaking of dirty looks, and they got to ride it with no wait. Love that Disney magic) Thanks again everyone. Trust me, Sydney really thanks all of you.