I think it can be difficult to track down women on social media because of name changes. I know a lot of women include their former last names in their FB accounts, but some do not. If they have a common name, forget about it.
I have two childhood friends I've been trying to track down for years. One has a common name with thousands of potential matches. I wade through them every once in a while looking for her.
The other has an unusual/uncommon last name and I still can't find her. I'm not sure if she's not on social media or just not using her former last name. Her son has a common last name, so I can't go that route, it's too daunting. I found one other potential relative but he hasn't been on FB for years. Like my college roommate, I'm sure she'll pop up someday.
I recently found a childhood friend that I hadn't seen since the early 80s. The last time I saw her, she was 17 and had just hitchhiked from FL to Maine with a guy. Now, if that doesn't sound like a classic missing teenager scenario waiting to happen, I don't know what else does. I found a Jane Doe in FL that looked just like her back then and thought for sure it could be her. It wasn't, I was finally able to track her down. And just because I hadn't heard from her in all that time, didn't mean she'd met an untimely demise, we had just lost touch. Which, before the internet, happened a lot if someone moved around a lot and you lost their address and phone number, you lost that person. There was no whitepagesdotcom in the 80s.
So, it is possible WCJD's friends ARE looking for her, they just aren't having any luck and haven't put two and two together yet and searched through unidentified remains. It might not have occurred to them yet to do so. Maybe they are waiting for her to pop up one day on social media, which has happened to me twice.
But, keep in mind Jimmy Reymer. His sister had been looking for him in the mid-west for 30+ years, and his JD photo was all over the internet, and it still didn't "click" for her or the investigators helping her. He was in NC the whole time. It took a classmate to finally recognize his picture and connect the dots. But for me, because this is something I'm interested in, of course I keep my two friends in the back of my mind when I go searching through remain, but it's not something I'm actively sifting through with them in mind.