What's up with Eri's acquaintances trying to take advantage of her for their murder tricks or trying to ruin her in general?
This judo person.
Before that, Eri's hairdresser.
In one early case, both the victim and the culprit tried to use Kogoro for their schemes, which the former did in an attempt to make Eri lose her confidence in her cases.
Yeah, if I was Eri, I would have serious trust issues, even more than usual.