Depends on what type of person she is. If she was a good friend to you before, and then she just "disappeared", then I'd have to ask why. Hopefully she would volunteer that information and offer up an explanation. Sometimes things happen. But if she wasn't a good friend before, and now she is just popping up without explanation, then I'd have to think it over. If her disappearance had hurt me in some way, or I really felt that she had let me down, then I would probably just let the whole thing go. <br />
Deserves thinking about.
I would. I'm not sure what all happened with your boss or why he/she would have anything to do with your friendships, but I think that clearing the air and finding out exactly where your "friend" is coming from would be the best thing.
I guess that's what I'd ask her. "I knew it wasn't your fault that I was let go, but since you were my friend, why didn't you call?" It could be that she felt guilty and somehow responsible for you losing your job. Maybe she felt guilty that you lost yours while she kept hers. I think I'd just calmly and respectfully ask what it was all about. It could be that she just wants to forget the whole awkward episode and start the friendship again where you left off. It will be up to you whether you are willing to do that.
depends how and why you two parted.
friends can do that if you really were friends.
I would ask her why she was contacting me after all this time. If we were really close before I would probably reconnect