Best bet for a really light knife that will likely do all small knife work and be comfortable on a neck lanyard.  Has a tapered tang, so it is also strong.

2 3/4" S30V blade, tapered tang.  Silver tweed G10 scales with black micarta pins.  Overall length 6 1/4", weight 1 1/2 oz.  You won't have any trouble getting her to wear this, if she'll wear any at all.