What the actual hell have I done? Massive mistake

[LemonCurdLucy]

Trying to keep this vague as it's outing.
Distant relative, early twenties, is going to move to my city. I offered a place at mine whilst she finds a flat. It will be for a month, and I'll be away for a lot of the time.
She popped over yesterday and ended up staying for a few hours. Spoke about her feelings a lot.
Now I'm concerned that I'm going to end up as some sort of agony aunt.
She's very vulnerable and hasn't lived on her own before. Recently cut ties with all of her family. I'm late thirties.
I feel like it's going to be a month of late nights, her talking at me endlessly, coming home drunk and me picking up the pieces.
Not only that she told me that she's just lost her job so she's going to move with presumably the intention of finding a job and finding a house, which might take a lot longer than a month.
I don't want to let her down but I don't think I can do this.

Blimey-it sounds like you are caving! I absolutely wouldn’t do this. Say goodbye to your evenings and personal space. I strongly suspect the relationship will break down badly when you have to eventually eject her from your house!

Exactly. And I’m sure she is all polite and nice now and chatty with the kids, but after a while she’ll relax and feel at home and likely be a different person. It’s like going travelling with someone you think you know well, but often turns out to be a disaster.

Just tell her you’ve realised you need the room for your dc and can no longer house her.

Absolutely this

You're being very foolish. Your poor kids.

I think this sort of arrangement has to be conditional on a job offer and clear plans to move on in a fixed timeframe. Close relative you have a strong relationship with might be a different matter.