Girlfriend (18) is going to be made homeless

Okay reddit, I’m normally pretty good at giving out advice but I’ve got nothing for this one, so strap yourselves in and here goes. I’ll try and do a TL:DR at the bottom.

I met this girl in February this year off of that well known dating app and she seemed to have her stuff down pretty well. She’s currently doing an apprenticeship that earns her around £800 a month (uk based advice appreciated) her current arrangement is that she lives with her grandparents and pays them £200 a month to live there, which is reasonable but they resent her being there and only took her in because she was technically homeless (living out of her car for a while).

So her grandparents asked her to find somewhere else to live about a week ago as I write this, problem is she literally cannot afford to live anywhere with her current payments (car insurance isn’t cheap for an 18 year old with an existing claim) and she needs the car to get to work etc seeing as we live in a pretty rural area with shocking public transport. She seems to think that her best option is couch surfing with friends but she’s looking at at least a year until she’s finished her apprenticeship and is earning proper trade money. Living like that is not sensible as you won’t have a registered address for bank statements, car insurance and all the rest of it.

This is where I might get a bit off track, I am 23 years old, making decent money for myself and own a house. She exhausted every option trying to talk it out with her grandparents who eventually said “if you continue to pay us the rent and only stay here when absolutely necessary and only if we’re here (won’t let her have a key) then you can still also use this as your registered address (they basically mean if you have nowhere once every two weeks then stay a night here) which, after thinking about it for a while seems like a pretty crappy deal.

Personal section, I like her, she’s pretty cool but we’ve technically only been dating about two months, of course, I said she could crash at mine whenever she needs but she also knows I enjoy my personal space 90% of the time.

So reddit, what can I do about this situation, I said either crash at mine or call citizens advice. Should I just ask her to give me the £200 a month and technically rent out my spare room or just leave her to couch surf? Psa: I’m not dumb enough to ask a girl I’ve been dating for two months to move in like that, but it’s the only thing she’d be able to do on her budget.

TL:DR girlfriend of two months being made homeless by family, I have the means to make this problem magically go away but value my own space and she knows that and seems reluctant to accept my help.

There you go reddit, have fun, I’ll be about for replies and stuff.