I met a girl abroad and now she is beginning to tell me not to kiss her?

I'm in another country visiting but I'll be leaving in about a month. Not so long ago I met this beautiful girl and these few weeks with her have been amazing. But she knows I'm leaving and I think it has made her a bit reserved.

Sometimes when we are walking or having a drink together I will look into her eyes, tell her she is beautiful and give her a kiss. But these past few days she has been saying things like "Stop doing that. I don't want you to look at me like that". Sometimes she says it in a serious voice but mostly she just covers my eyes and says jokingly "Please look away".

Have I done something wrong? Is it because I'm leaving?

...how about you ask her?