...she even went on ToT twice (the first time she loved it and wanted to go again, the second time she said it "hurt her feelings").

My son pops that phrase out every so often at strange times, LOL. So much so that my brother and SIL (blissfully child free) connect it with my son, and they'll say it to each other when they are being silly.
OP, is this their first time? If so, you'll have NO idea what they will like or not, so the best advice is to start gently. So you start off with the ones that they can see from the line, like Dumbo, Teacups, and such. Or even start off in a bug's land at DCA, b/c everything is out in the open. The version of teacups there is nice b/c you can't spin it to make it go faster. Flik's Flyers is the same motion as Dumbo, but you're all together in a "box".
For some reason my son had a strong and negative reaction to Alice, so even though the line is cute and bright, I personally can't recommend it as a starter ride...then again, DS hasnt' heard or seen the story.
Once they see how things work at DLR, that things won't hurt them and are fun, maybe the Jungle Cruise would be fun! Though not at night...my son who LOVES the JC was so freaked out when we went at night that he was trying to lie down on the floor of the boat. Poor kid.
My guy never made it past the "stretching room", a big elevator to get to the actual ride, of HM b/c some of the adults who were on it were apparently scared out of their minds, and screamed bloody murder, which scared DS very much. I couldnt' convince him that they were being silly, so he and I took the "chicken exit".
For my son, when he was 3, that was his year of being scared of rides he actually loved...but I don't know if he would have been afraid if it had been his FIRST time there. Or maybe he would, but that reactino would have been all we knew, rather than knowing he liked things at 1 and 2.
I could go on, but I think that sticking with the basics, starting easy and open and cheery, then going further if they are fearless and not going further (or splitting up) if one or both of them is NOT fearless, is going to always be the good way to go (as everyone else has said, pretty much!).
