What do you think she might get from those interactions that makes her light up? Perhaps some observation of what is going on that makes her so happy may be useful...For example; I am from a very quiet family. We do, as opposed to talking. My wife, on the other hand is from a very boisterous Hispanic family, the yapping never ends. I have to make a conscious effort to make sure I hang out in the kitchen and talk (ad nauseum in my opinion). This is a love language for her. Without it she withers, or becomes hurt/angry and feels I don't care about her or the family. This is not natural and has been difficult to learn but it makes a big difference to her.
What your wife gets from her family interaction is likely very deeply rooted, powerful and soothing, so deeply that she doesn't even realize it. You however, recognize it makes her very happy. Perhaps if you can identify and make an effort to provide some of whatever it is she gets from those interactions, it may serve the relationship well.
Me 44 She 46 S13 D9 M18 T23 3 years DB'ing Successfully busted