Weird AF? , title too short

So I have a kid I haven't heard from in over a year. She married a narcissist and things took a turn towards crazy when they were expecting their first child. She's pregnant again, we only know this because someone took a screenshot of her fb page and sent it. She's got to be pretty far along but not sure precisely when she is due.

So today, looking through an old friends fb page we discovered pics from a beach trip, probably Memorial day weekend. There's my SIL, his best friends wife, her sister, and their mother looking really cozy. Missing from the pics are my daughter, my SIL's best friend, and the step father of the two girls in the pics. To throw another layer of details, the "best friends wife" was once married to my SIL's older brother.

There were several pics, on the beach, in a restaurant, etc. I can't believe my daughter could have been there and not ended up in at least one pic, or for that matter the SIL's best friend. Nor can I believe she would have been ok with him going off for the weekend with three women like that, especially considering how far along she must be now.
Not sure what to make of all this. Tipping my son off about this sometime this afternoon, he's friends with the SIL's older sister and maybe he can get touch base with her to see if she's heard anything.