Peppermint oil is supposed to make a good mouse repellant, but you'd have to research how that would affect hedgie. We had a mouse (lets be honest, mice) in our apartment, but once I started spraying the kitchen floor (where it was coming in at) it with my personal cleaning solution (its a mix of lemon, lavender, and mint), it stopped getting into things--and then when we got the cat, its made itself scarce.

I also suggest pulling out all your appliances, furniture, etc...and cleaning your cabinets, particularly lower cabinets that might store foods in boxes or bags. Other than that, traps (and bait them with stuff that is tasty)