When a toxic friend starts being nice, what do you do?

So I was about to drop this toxic friend because she actually made me cry and stuff the last 2 years, she was so rude to me.

But recently she started being nice for no reason just as I’m about to drop her? She did me a massive favour and was super sweet and kind. What do I do now? Should I drop her?
When a toxic friend starts being nice, what do you do?
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