Assuming that her oxytocin levels are pretty high right now, I think... her level of detachment isn't a representation of how much of a lack of love she feels. In fact, I think it's opposite.
INTP tend to have a very unique ability to keep a really 'calm' mood. I think some people deal with attachment in different ways? Some people appear to be more attached, are in fact, less attached, vice versa. I know an INTP who deals with this issue- she keeps it well kept. She appears aloof, but she battles with feeling too clingy, so she intentionally keeps distance with some people she dates in the beginning.
Give it a bit more time man.. Eventually, when she gets comfortable with you, she may even pay you a random visit in the middle of the night- Hop a fence to get to your door. <--- Not for sex, but to talk about intimate stuff that inhibits her.
That trust, my friend.. takes time and 'space.'

I think INTPs like my friend have a good heart- so if you're feeling her? Keep on being you, have faith, and let her be off alone for a while. Eventually, things will work out, depending on how honest 'both' parties are with one another. Honesty is key!