A teenager says she was left incoherent and unable to walk after being spiked - at a Taylor Swift concert.<br /><br />Grace McAleavy, 18, started getting confused and slurred her words while she watched the megastar perform at Liverpool's Anfield Stadium on Friday (June 14).<br /><br />She says she felt fine before the show started and hadn't drank any alcohol - but when Taylor started her '1989' set, she thought she was going to be sick.<br /><br />The teenager then started slurring her words and eventually was unable to walk - and now she believes she was spiked at the sold-out gig.