I think my Mom/Gabby questline bugged out, assuming it has a conclusion at the moment. I went to the conference after talking with Beasley about the necklace, successfully charmed Gabby and got her to tell me where Mom is, but when I go to Gabby's house there's nothing there.
Futzing around in the cheat menu, I can see that Gabby's flags for "Conference over" and "Asked where mom is" are set to false, but setting them to true makes me unable to enter her house anymore. Also, Mom's location is listed as 998, which makes me think she's gone for good. Did I do something wrong, and/or what flags can I flip to fix this?