Plot hole: SPOILER: When Amy comes back, doctors would have checked her non-existent head wound from the "abduction", from where she supposedly lost that much blood. That would and should have revealed all of Amy's lies.
Plot hole: Amy calls the Police about the shed before going to Desi. They watch Nick's TV statement together. The shed is only searched by the police after the statement. Which would imply the police sat on the report for several days before investigating.
Chosen answer: That may have been what she was doing. Amy was attempting to make it look like she'd been repeatedly raped by Collins, so she was doing various things to herself, like using a bottle to self-inflict trauma onto her privates to look like forced sex.
raywest ★