No. I'd leave it well alone - she fleeced you, and regardless of whether she was depressed, had other issues going on at the time, in all probability, she knew exactly what she was doing. To you, to her boyfriend, and even though you've never asked, most likely to your other friends who she suddenly tried to 'Wendy' you over.
I do understand where you're coming from, though. I had a friend whom I'd known since the first day at school. And although she didn't fleece me for 100s of pounds... she did decide that I was no longer "good enough" to be friends with her. Not once, but twice - the second time was because she'd approached me outside the school our oldest children were attending, three years after she'd ghosted me and claimed that she'd been depressed; could I ever forgive her and be friends again? I fell for it. Within 3 years, she'd repeated her behaviour. And losing her friendship - both times - hurt like hell. But it also taught me that I didn't need someone so toxic and messed up in my life. I knew too much about her, she was probably anxious I'd inadvertantly drop her in it at some point, so... I was dropped and ignored, as though I didn't matter.
But I do matter. As do you, OP. You need to understand that the old adage "fool me once, shame on you; fool me twice, shame on me" stands. If you re-establish a friendship with this woman, can you honestly say that you'd feel able to trust her 100%? That you wouldn't have niggles of doubt if, say, she were to invite you somewhere, or spend a small fortune on a candle, that she wasn't up to her old tricks again? It'll eat away at you, if you do. And that's not a basis for friendship.
Move on, OP: make friends who won't steal your money from you!