Should I say something?

So, my sister in laws and I were planning a party. As we are trying to see who to invite, I happen to notice that my husbands cousin has me blocked on Facebook. We have never had a problem before? Heck, I hardly talk to her or see her. When I do see her, we have always been friendly. All these years I just assumed she didn't have a Facebook. I can't imagine what she has against me. I hate to bring anything up and sound stupid but I'm 100% sure I'm blocked. My sister in laws checked their pages and I checked my husbands page, they are all friends with her. I shouldn't really care but it bothers me that she must have a problem with me? If I do say something, how would I ever bring it up? 

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