How is she hiding it in the skirt? Is it clipped IWB? I've handled the CRKT Mini My Tighe, and I really liked the feel of it, and it was pretty slim. If it's more important to be slim and concealable (rides deep in pocket/waistband) consider a Sypderco Delica with a wave. It's not assisted opening, but opens immediately upon extraction from stowage, and is extremely slim.