Mother-in-law does not use pictures with me in it!

So, this has been really weirding me out recently. I have a great relationship with my wife's mother, but she does this thing with pictures where she doesn't display pictures that have me in them. To contextualize this, let me just say that she speaks only Spanish and I do not, so we do not usually have very complex conversations with one another, so lack of communication may be a part of this. She also has moderate anxiety and seems to be suffering from empty nest syndrome because she feels bad about how she parented my wife. She was a great mother, but I suppose her anxiety has caused her to look at what could have been more than she should. This has caused her to be unusually clingy to my wife in recent years. My wife and I actually eloped, but my relationship with her family has been great nonetheless and all seems to be forgiven. Now regarding the photos: The first instance in which this issue caught my notice was during our first Christmas, when she and the rest of my wife's family essentially designated me as the cameraman for all of the Christmas pictures. In one sense I don't mind this, but I would also like to be included in some as I feel I am part of the family now. But nonetheless I end up getting into only one or two of the 10 or so variations taken. Well this basically occurs every Christmas and vacation whenever there is an excuse to take pictures. In all of these photo sessions, she usually will have one or two with the "original" family, one with her husband, but will have 4-5 photo variations of pictures taken with just her and my wife. Last Christmas we additionally went to have professional photos taken. This is weird to me, but she had the professional photographer take one or two pics of the whole family and I together but then had me leave so they could take the rest of the pictures together. I did get one shot of my wife and I, but she once again had like four variations of pictures taken with just her and my wife. Finally, she came to visit us this past weekend and we all visited the local University I attend. Once again i was designated cameraman and so was excluded from most of the pictures, but there were actually a few that were taken with me in them. However, she did not upload any of those photos to FaceBook or print any out for use at home. In terms of the photos she displays at home, there is always a ton of pictures of her and my wife, with just a few of the original family and, if I'm lucky, one or two of me. She even excludes me from the photos she has displayed of our wedding! I realize this is not the worst thing in the world; I certainly have a great relationship with her and much to be thankful for. But something about this just rubs me the wrong way. I feel excluded because of her behavior in these photo situations and additionally feel that she is overly clingy of my wife since she seems so interested in having countless photos of just her and my wife taken and displayed. I theorize that this has much to do with her anxiety and empty nest syndrome, which causes her to be extra clingy. But excluding me from most photos and even my own wedding photos; what is going on here? Any thoughts?

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