How to know whether a Cancer woman has lost interest or not?

Met a female who is 4 years older than me at an exchange. During the last week of the exchange, I think she grew interest in me and stuck by my side most of the times. I also sensed that she stared at me from far distance but I didn't want to embarrass her by returning a look although I think staring at a person is quite rude.
But 1) I am not used to this intimacy (my own community is cold, so I am used to oppressing my own feelings a lot) 2) she just suddenly clung onto me 3) I didn't think we were that close 4) I was still processing how I attracted her. So on the last day, I found her on the last day for photo-taking during the farewell reception (she stared at me again yet didn't find me for photo-taking). Then she suddenly hugged me and asked me to have tea with her the next day (I told I'll being staying longer) if I had no plans, but I frankly told her I had and it's a far place from there. Yet, she still told me to text her if I would be free then.
Since I was just treating her as an acquaintance (I think we would become good friends because we were peaceful and I could read her mind most of the time, my specialty lol) but I think she didn't want us just to be acquaintances?
The important thing is, I was aloof to all her gestures because I haven't been that intimate before and need time to heat things up while she's already into me (?), so did I hurt by rejecting her invitation and once again not finding her for tea?