Was tonight the first time she told you about seeing these things, but she's actually been seeing things (or interpreting existing signs) for a month? Yikes. I'm scared too. I hope you can get her in to see a doctor ASAP.

My sister-in-law had a condition recently where she was terrified that aliens were going to do something and she had some kind of time machine in the house that would keep them away (something like that, anyway). I think it was delusional disorder.

Good luck and strength to you and L as you navigate this. Jo could not be in better hands, even though I know this is super scary. Hugs.