How to know if she blocked me?

So, Iíve been chatting with this girl on a dating site for a while now. Weíre not really a couple per se but thereís something going on between us. Iím planning on making it official after we officially see each other in person. That will have to wait until next year perhaps because sheís not from the same country as I am. Anyhow, my problem is that I canít seem to find her in our chat thread or her profile anymore. I tried the Search women by ID feature but still canít find her. I told a friend (who uses the same site) about this and he tried searching for her. He said he couldnít find her anymore too. Is this like a technical problem or did she delete her profile or something? Is it possible that she blocked me? How do I find out if she did?