To steal the advice of others, try emailing Araeph directly. She may have left the address on one of her posts, like I usually do.

she still typically answers AIM and email pretty consistently.

Most of the exceptions come when the author of a mission has something specific in mind for their recruits, since they would naturally get first dibs on the new character that they introduced. Obviously, you should try to contact whoever originally wrote the mission before using the character if you can, not only because it's good to get their okay on this sort of thing, but also because if you missed something in your background research, the character could have been loaned out to someone else you'd never heard of and future stories would be going against the character's previously established history, or the author could have decided on the Board at the time to put them in a specific location and you just didn't know because the Board recently wiped out all pre-2013 posts for some reason.
But, if you're interested and there are no protests to using a previously recruited but until now unrealized character, you should be able to do so. Or, you and/or the original mission writer could even make whoever it is into a free-to-use character, so that anyone can write about them whenever they want. We don't have a lot of free-to-use characters right now aside from the Flowers, which is unfortunate. It's a shared universe, and so it makes sense that there would be more than a handful of shared characters.

To directly answer your question, I don't think anything has happened to Wilma Turner since she was first recruited, like what happens to most of the characters found on missions. I've had plans for a while to just make a gigantic list of our unrealized recruits and post it under Adoptable NPC on the wiki, but it's going to have to wait, since I'll need a few days that I'm not juggling six things do do at once and can get down to a reasonable three or four.