Leo, if I were you, I'd laugh this off and try again with another woman.
I suspect the lady has had some bad experiences with the dating services (which is pretty common!) that turned her off. Or she is, herself, really bad news.
Personally, I think your note to her was very polite and sweet. Since you noted that you're a foreigner, she shouldn't expect you to use American slang.
I know some women using online dating services who'd probably kill to get a nice note like yours instead of the sleazy stuff they actually receive.