I'm guessing that you have a RWG map and she didn't spawn on the map. Enter debug mode and open the poi teleporter. Type df you should see Razor, Caitlin, Eve, Anna, the Bunker and Lab, at a minimum. I don't currently have the experimental version installed but this is the advice from earlier alphas.
If this is the case, unless you know how to add a POI to a map and an existing save you need to start over and use one of the df pregen maps. There are plenty of videos out there (and in even in this thread) on how to add a poi to a map and get it to show up in your save.