I'd think that she's either creepy, has some mental illness, religious or that she's lying. Since that shouldn't be the case if she's above the age 20... overall something would have to be wrong there and my black ass would not stick around long enough to find out.
It's a very positive thing. She is waiting for the right guy and he will be a very lucky guy if she chooses him to be her first. I'd think nothing negative about her what so ever. She maybe a little shy or lacking in confined but who isn't.
She's a religious freak, is never going to put out until marriage but is looking for the absolutely perfect man which she will inevitably determine doesn't exist then, as her beauty fades, she will get more and more desperate until her value is half of what it once was and she has to settle; or she has some serious issues beneath all that hottness; or she puts absurd value on a thin membrane surrounding the vagina which makes up part of the vulva, for some arbitrary and most likely nonsensical reason. Or she's a lesbian.
That reminds me of this one super hot chick I knew for a couple weeks. She was also a virgin. She had voices in her head telling her to kill everyone. That's sorta how I view virgins, now.