How do you handle awkwardness in friendship

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I have a friend I have been close with for 22 years. Over the last few years, we have drifted apart and do not see or speak with eachother as frequently. We both have had children and are very busy, but there seems to be an underlying unspoken issue that has caused some of this separation. I love my friend dearly, and she is very sensitive. I do not want to cause a problem, but want to be closer again. Since I have had my children, other than for her children's birthday parties, she has never invited my family to do anything socially or even to her house just for dinner. She has not been the type to socialize much, and doesn't do much individually separate from her husband and children. But in the last two years, she has become close with another friend who has one child. I have started to hear about all the time they spend together going to eachother houses for dinner, or to movies together. Before, this was not something that she would do. But now that she has been spending time with this other friend socially, it has created some awkwardness for me because now it seems like there has been some reason I am unaware of that she has not chosen to spend time with our family. She does spend time with me individually, but hasn't invited me along with my husband and children to do anything. I am not at all upset that she has become close with another friend; but it just has brought attention to the fact that she doesn't invite my family to do things. I don't know of any problems that have occured with my husband or children and her husband or children, and they say they love us like family. I want to be closer to my friend again, but I feel uncomfortable to bring this situation up. She is so kind, I don't think she could ever be honest enough to tell me something bad, and it would upset her as well. What would you do in my situation?