sounds like you dig her more than she might dig you ?
Do you want a relationship with her?
ask her why she dumped you? honesty is key.

i say, dont be confused. chill, take 1 day at a time, dont put your heart and soul into her or whatver you're getting at with her, keep a little distance and ride it out. it'll either become something or not.

senior? as in college? high school? either way, you're young, play the field, don't get into any long term relationships yet because people change and you think you know the person 1 year next year completely different (new ideas, experiences, beliefs, etc. etc.)