So let's understand the motivation here: if in the first place you spoke to her in English, YOU'D know that she undetrstood you and how well. But you figured that you could flatter her so that she'd be interested in you if you spoke to her in SOME dialect of Chinese? What happens after
you speak that one phrase that you know is exhausted. It's not like you can sustain speaking to her in her native language. Any woman, Chinese or not, can see the shallowness behind that.