need woman's helmet recommendation

Building a bike for my gal and we're having trouble finding the "right" helmet for her. Price is a real issue as it is her safety we're paying for.

We've tried on some lower-level Giro & Bell that fit ok but were big for her. We tried on a mid-level Rudy Project but too much fore & aft pressure with tons of space on the sides.

Any recommendations for a small, narrow head?

Off list please.