I'd back off from her and be leery. It sounds like she's always been something of a grifter, to be honest. I have a couple of old friends who sound like her and what they really did, for the most part, was live off men.
But that has a way of ending with age. So then, older, with no job skills or savings and health problems increasing, they'd look around for someone else to supplement their existence.
It sounds like she's laying the ground work to rope you into lying for her so she can get housing that's more than her fair share. And she's told you straight up that she tries for the most she can get, something for nothing. Yes, I see why you're having second thoughts about her!
She might do a little something for you here and there but she needs far more help from others than you do, so I wouldn't feel indebted based on that, though she'd probably like you to. My experience with people like her, or people who sound a lot like her anyway, is that they're very skilled in getting a free ride. In other words, manipulative.
I'd expect her trying to lean on sympathetic people to steadily increase, from here on out.
Here in the US, we don't have the same safety net that you all do. I've had a couple of friends who sound like her start making me uncomfortable when we all got older. After giving in on a couple of things, I decided to back off at their renewed attempts at getting closer, after years without much contact.
I figure it costs me at least $1,000 USD (750 pounds) per month to have someone stay at my house, aside from the intrusion on my family life, privacy, routines, etc. There are basics like groceries. And any problem they have, becomes my problem. Medical/dental requirements, transportation, etc. Also, my husband and I have achieved a level now where we can go out to dinner a couple of times a week etc. and it seemed rude to leave a houseguest at home, so.
I feel for them, to some extent. You can't always make up for many years of throwing caution to the wind.
Anyway, the short version is that I'd be careful with her. Good luck.