@2AR2 I'd say it's more likely to become like those hair monsters you can't destroy unless you attack the true body, which it can generally hide quite well while enveloping entire areas in its hair to attack or use like a spider web for trapping.
You know, normally I would ask you to keep the horror tag out of this wholesome manga, but after seeing that Kedamamo sprout legs and scurry away I'd say you are justified.
@Glomoro Yeah, but it's ALL hair, there's no actual body in there. So, fire is probably your best option. But why are you trying to kill Kedamamo-chan anyway? A good quality shampoo should serve as a means of exorcising it.