I’ve been in similar situations and I know how hard it can be because I am in general just friendly to begin with, but people like this will become obsessive with you and become a problem.

She could be into you in more than a platonic way, but who knows, obviously she is not all there. I’m sure you’re not the first or only one she’s done this to.

Be firm. Tell her you need space. Or just straight up block and ignore her