Love / Confuse about how friendship works in Poland [3]

I'm from the US and i has visited Poland twice and i became really good friends with this girl and we call each other sisters.

My confusion is: she would ask me how are you but when I ask her how is she she never replies. She always Let me hanging.

And now for example she asked me how am I spending Christmas. I answered her and then asked how was she spending Christmas and let me hanging.

Is that a polish thing or maybe she doesn't wanna answer, or she doesn't trust me or maybe just being rude. I don't wanna judge. I know is a different culture. I just wanna get more insight on friendship.