Does this girl have a problem with me or is it in my head?

My boyfriend is good friends with a couple, a boy and a girl, and is especially very close with the guy. They all live quite close, and I live quite far away. I only really properly met them when I started going out with him (1 year ago) and I have seen the guy once since, but not the girl. When I first got with my boyfriend, the couple were really happy for us. We all met up and the girl was saying how nice we are together, and I added her on facebook, and she was liking my pictures and stuff. She invited me and my boyfriend to her place another time, but we could not make it sadly. I talked to her on facebook a bit and she was generally really friendly. However, since then, she seems to completely ignore me, and I have no idea what I am supposed to have done. My boyfriend came to stay near me to do a work placement for a few months, so he did not see them at all at this time. Her boyfriend commented on a photo of us, so I struck up a friendly conversation with him, and we exchanged a couple of messages; just very general stuff, about work, talking about my boyfriend, asking how his girlfriend was, and that is all, and then it stopped after a couple of messages. When my boyfriend was due to leave, I thought it would be a cool idea to organise a kind of welcome back party for him (as I was going to stay with him as well at first) so I sent the girl a message asking what she thought, if it seemed a good idea, etc. But I never heard back from her, and have still never had any kind of response, and this was months ago. I know she saw the message because of the ´seen´ feature on facebook. She no longer likes or comments on my pictures like she used to either. I could say she is busy but she is on facebook quite a lot, always commenting on stuff, uploading pictures etc. When I went to stay with him when he first went back, they knew I was there, and my boyfriend suggested all doing something, but they never proposed anything. Then, after I left, they invited him to theirs. I have been there a few times, and they must know every time I am there (my boyfriend sees the guy every day so he obviously finds out through that) but I have never been invited or they have never asked to see me. One day they were both free, and then my boyfriend was supposed to be told what time we should go and see them, but we never heard. Then, his friend claimed he did not know I was here, but I did not believe this. I have seen the male friend since, as I have mentioned, and he is very nice and friendly to me. I do not think it is him, but I feel like the girl has a problem with me. My boyfriend has even said she can be very bitchy and a nasty person, and apparently she even admits it herself. I just do not understand why she seems to ignore me now, I literally did nothing at all to her or to him. Does it sound like she has a problem, or am I just being paranoid? just find it rude they could not even make the effort to meet for 1 hour, after all of the times I have been there.

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