What is the ideal weight for a 17 year old 5'5 female?

It depends on your build, activity level, and genetics. As long as you're within the Body Mass Index criteria and you *feel* good, then that's the ideal weight for you. If you don't feel good about your weight or you want something a bit more specific, that's something you should take up with your doctor because she/he would know way, way better than anyone on the internet.