The situation:

When I came to the Vault 81 at first time, Austin gave me a tour - and everyone/everything there looked fine (as fine as it should be, I think), including Alexis. At that moment she was trading in the depot - I remember I sold some stuff to her. So I've taken the quest to look for Ashes and left the vault for a time. After finding cat and returning back to Erin - I've found weird sh*t in her room - Alexis's body is just lying on the floor with some basic loot on it. Holt Combes is sitting on a chair near wife's body. Erin is sleeping in her bed (it was night). Basically, everyone here is behaving as if nothing had happened. I can talk to both of them (Holt/Erin) - but there are no dialogs/phrases related to dead Alexis. So I guess it's not a designed situation but some sort of a bug. Or it's not?

I had plans to buy some legendaries from her later - and it seems I won't be able to do this now. Moreover, I don't have previous saves that I can use to make her live again. So the question is - is there any way to "fix" it? Maybe there is a console command to "revive" specific person?