Is this Japanese girl interested?

[Lucas C]

Basically five years ago, I met this Japanese girl at an language exchange school where I had to teach this Japanese girl English. We met once and she seems to be of the somewhat friendly type. So then to keep her as a friend, I asked for her facebook. At first she seemed reluctant and then she did anyways. So after she sees my profile and everything, after from then on I feel like she always checks out my page or pays attention to my profile somewhat because for things that I like or statuses I post sometimes, she posts similar things as me. Then she starts liking things related to my culture and even started the type of music I like and post food on her facebook that is related with my culture. I say happy birthday to her every year and she seems really enthusiastic with the thanks and and these happy faces. But after these many years, it's quite awkward for me to talk with her since we aren't really close and she is back in Japan. But I am just wondering, is she interested somewhat? like usually how do Japanese girls react when they are somewhat interested in somebody?
Anyways, 10 points for the best answer!