Do you have any idea what the knife will be used for? The only thing you stated was that you want it colorful and a price range. The knife being gifted to a girl does no provide any useful information.
Intended use dictates the type of knife.
Without any further information I would say that SAK's are a sure bet, since you can always find uses for it, is non-threatening, light and cheap. Everyone recognizes it as a cute tool. They also do not require to be carried clipped to pants.
If the future user enjoys the outdoors, then a single blade, one hand opening, more substantial blade could be in order. Any Spyderco Salt with yellow handle could come handy so it can be spotted easily if dropped in the wild or water. The H1 will not rust no matter what.
And in between there are plenty of choces, some good ones already mentioned. I like my yellow handle Benchmade Minigrip (sheepsfoot) a lot, to mention one of mine.
Mikel