Best Friend of 16 years drifting away

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So my best friend and I have been such since I was in 3rd grade, 16 years ago. We used to spend time together all the time. I worked 5 minutes from her house for a while and on my lunch breaks I would go over there and just hang out, even if she wasn't home. Almost 5 years ago, I got married and, at first, she and I still spent tons of time together, especially when my husband and I were split up for abotu a year. After he and I reconciled though, she and I just haven't seen each other much. I mean we used to hang out 5-6 nights a week, now I'm lucky if I see her once a month. And when we DO get to see each other she tells me about times she's hung out with "mutual" friends of ours but no one ever calls me. I thought it was because I'm married and have kids, but two of our friends got married and she goes over there more than my house (even though I know for a fact she thinks the wife is annoying lol) Maybe it's cause she likes to drink and I don't but that's never been a problem in the past, I was just the one to hold her hair back for her. So basically I'm just kinda ranting cause it's easier than talking to her, but maybe some of you guys have any ideas about how I can breach the subject with her (I've tried asking "why don't you ever call me to chill with you guys" and her response is always "well they invited me I can't invite someone else" or "well they don't really like your husband" etc.) I'm just at a loss as to why all of a sudden I'm no longer important to her. My parents are good friends with hers and they say that her parents are the same way with them- never thinking of them to do things with, my parents always have to initiate. So is my best friend just inconsiderate or have I changed or what?