I've got a friend that I've known for a year. She made me uneasy from day one but was part of a wider friend group so I kept my distance somewhat but saw a lot of her. I was the only one in the group that rarely saw her 1:1.
She's completely odd (kind of unpredictable, unhinged, unreliable) but always very nice. As such, I put her behaviour down to her just being an unusual character. Amongst other things, she always claimed to be very wealthy but never really explained how, but is always "forgetting" her bank card. But at the same time managed to be very generous (too much, if anything).
It's starting to transpire that my unease was right and she is at best not as well-intentioned as she seems and at worst, is a total scam artist.
We don't really have any concrete evidence of this or any grounds to "remove" her from our circle of friends but we all very much want to distance ourselves from her.
How do we do this without all hell breaking loose? Particularly if she is indeed unpredictable.