I (23 M) was on a work trip and stayed with a group (3 girls and 2 guys) for a month. One of the girls and I got really close and while I was preparing to travel back home she was very sad and spent my last night there with me, brought gifts for me and also made a card and some other stuff to wish me goodbye. She kept asking me to stay there a little longer and that she knows I won't stay but still she wants to try to make me miss my flight somehow.

I too liked her a lot and I spent a really great time with her. But I maintained frame and bade her goodbye and boarded the flight.

It's only been 4 days since I left her and came back home but now I keep receiving messages from her with nothing but "no face emojis = 😶" and no matter what I reply she only sends that emoji and that too after hours or days later.

I was really thinking of finding a way to enter a LTR with her but I don't know what type of a game she is playing and what should I do?

Can somebody help me with this and also please tell what this emoji means.