<human>: Can you succinctly summarize the text in 1-3 sentences?

I've known this friend for about two years. We see each other regularly at least once a week at a fairly casual and relaxed gathering of people. I don't talk to her all the time through Facebook, but we have chatted on it a fair amount throughout the two years we've known one another.

About two weeks ago, I sent her a message on Facebook just saying hi. I didn't get any response even though it said she saw it, figured she was busy and thought nothing of it. Two days after I sent it, I sent her another one just saying "Hey, how are you?" no response at all that day or evening, or the morning of the following day, though she had seen it. The afternoon of that day, I log onto Facebook and check the other messages I had, and noticed the seen symbol was different on hers, as though it was only sent, and not seen. 

I decided to look at the message just to see what's up. Find out my friend's name is no longer clickable and can't go to her profile page. I thought that was weird, so I searched for her, and couldn't find her there either. On Facebook mobile in the messages she had sent me previously she just shows up as "Facebook User". Considering this is all the signs of being blocked on Facebook, I don't really know what's going on in that sense. Another friend of mine has said there is an occasional glitch where people get blocked randomly without the person clicking "block", but I don't know how true that is. 

However, just last week when I saw her, she seemed happy to see me, talked to me as if everything was normal, asked me how my week has been, and just regular friendly stuff. So I have no idea how to interpret this Facebook blocking thing. Is it possible it's actually a glitch? Should I ask her about it? And if so, I don't even know how to say it without it seeming confrontational.
<bot>: It appears my friend blocked me on Facebook, not sure if it's a glitch with Facebook. How do I interpret this situation/ask about it without coming off as confrontational?