Offhand, I don't know the age of consent in New York. But if you're right that it's 17, and if she is 17 already, then there shouldn't be a problem. Besides, the age of consent only governs when she can have sexual contact. She could still have a non-sexual relationship before she reached that age.
Two other points:
1. "Sexual contact" doesn't only mean intercourse. A lot of other behavior qualifies.
2. The age of consent in some other states is 18. If the two of you visit one of those states while she is still 17, sexual contact there would be illegal.
Offhand, I don't know the age of consent in New York. But if you're right that it's 17, and if she is 17 already, then there shouldn't be a problem. Besides, the age of consent only governs when she can have sexual contact. She could still have a non-sexual relationship before she reached that age.
Two other points:
1. "Sexual contact" doesn't only mean intercourse. A lot of other behavior qualifies.
2. The age of consent in some other states is 18. If the two of you visit one of those states while she is still 17, sexual contact there would be illegal.