Your lady’s generation may well be the first to have that freedom of romantic choice, and that's something you need to keep in mind while making your decisions for your relationship – there simply isn't a ton of cultural precedent for her to fall back on.Think about it: when you consider what to do in terms of relationships, don’t you use your parents’ marriage and/or relationships as a reference point?
Even if it’s not such a big deal to her personally, it's still something that's on her mind and that her parents will be bringing up just about every time they see her.
As a result, being intimate before marriage is a lot less common in China than in the West, though this is not so much the case anymore among younger, more urbanized Chinese.
China is relatively new to the whole modern-stable-globalized-internet (still working on that last one, really) country thing, and when your culture is over 4,000 years in the making, old habits die hard.
Consider, too, the generational issue at play here: The lovely lady you’ve been crushing on’s parents and grandparents are the ones exerting that pressure to get married, even though she herself may not feel that she’s ready or interested.
That's because her grandparents' and possibly (depending on where in China she is from) her parents still value marital stability above all else in their time, given the instability and volatility of their eras.