Why she hides her pictures?

I've found her on Facebook. The reason why I've texted her is because we share some commonalities. First she sh1t tested me. She is 18 and I'm 24. Then she got interested in me. And now we are chatting for 2 weeks. Few days ago we've agreed to meet in person at mid June. Yesterday I've number closed her, at first she didn't seem to give me but then she seemed "happy" with it. And she uses her mobile phone operator to access Facebook (for free), however there are no images.

I can see her profile picture however her face is 13 pixels and she seems attractive but I cannot say for sure. Few days ago I've asked her picture and she told me "ok, I'll send you when I find a computer", yesterday I've asked her again and she told me "what if you don't like me". Because she is physically active girl (playing sports) I don't think that she will be ugly. It is same with her close friend (attractive but hides her pictures, also uses sunglasses)

I don't know, why she does not want to be seen? How I can make her to show me her picture?

(see the attachment, don't worry, I live in a country with very low English literate, very low chance to be found, also this image was/is public)