What are you looking for with this chick?
A fling, a one night stand, a LTR??
What exactly?
If its a fling or one night stand good stuff, no problems to be had there.
If you are looking for an LTR though and this girl is fairly young without a lot of experience and you get the LTR going anyway, over time she could begin to wonder what she's been missing out on. In essence you will be giving her a taste of things to come and come some more heh heh.
So a fun fling or one night stand is the best course of action to take with a chick who doesn't have a lot of experience under her belt while going for an LTR with a young inexperienced chick is a huge risk for you emotionally as you are not setting yourself up for the best chance at success since going for a chick like this who hasn't experienced life is likely really not ready to settle down at this point with one guy permaneantly.
She could be the exception to the rule and you two could have a wonderful relationship with eachother together forever but then again I could win the lottery tomorrow but thats not likely to happen either.
So the answer to your question is dependent on what you are looking for with this chick.