Safe bet is yellow or a current popular color is a "barn red" color. A technique that that is very neat with stripes is to use one color but mix the finishes. For example, use a flat finish for one stripe and a gloss for the next and vice versa. It is very subtle but so very neat.
If your daughters room is small you should choose lighter colors so the room doesn't feel too crowded. If the room is larger you can choose pretty much any color. Toddlers love bright colors so choose a color that is stimulating.