Is this girl still interested?

So I met this girl via mutual friends 2 weeks ago and she kept looking at me when I wasn't looking her way.

Then a week later she was avoiding me when we got together (in a group) but when I spoke to her she seemed nervous and friendly.

I thought she was interested.

Then I saw her like 5 minutes ago outside the library while smoking and we said hi and spoke for like 5 minutes.

She didn't seem as interested as last time but asked me questions like where were you studying before and what's there to do in this city and nearby (she's international).

I coudnt ask her out couple of weeks ago but now I can. But is she still interested? Seemed like she kinda lost interest that I didn't ask her out?
Is this girl still interested?
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