There's nothing toxic about Maya.
I have to be honest, in one of my first posts here in this thread I also defined Maya as a toxic friendship (and I wasn't referring to her night time appearance...). I said it as an exaggeration. I was referring in particular to how even in situations where in theory she was on the wrong side she always managed to find herself in the role of the one to be consoled.
two situations in particular:
1) the evening after the grinding, when she waits for Mc in her room to explain/apologize about the incident, first MC practically has to get every single word out of her and at the end she ends up venting on him for her family problems...
2) when she runs away after the reconciliation between Josy and her father, she is there for Josy but even in this situation she turns the situation around so that it becomes another moment when she can vent about her problems
toxic was surely an exaggerated term, but we can't deny that Maya represents a person who's really hard to be around, for everybody, for Mc, for Josy and also for Derek, as she herself admits in the end with Mc in the library in the sixth chapter, he met her in her worst moment but he still decided not to run away
then personally from chapter 6 onwards I started to appreciate her, she still has a long way to go though (and I would be grateful if she would stop explaining how loans work in Duckburg).
now I would probably, out of interest, put it in second place behind Sage