Hmm…
How does she like the factory grips? If she like ’em, Chigs looks like a good option. But, personally, I think the factory grips leave a lot to be desired. My 3” .357 has been wearing Hogue Overmolded for a couple decades, and I’ve never looked back.
I think she’d appreciate the egos and comfort of the Hogues, but as you point out, the colors are limited. However, I’ve recolored a number of polymer items using good ’ol RIT dyes. Black is a real challenge, so you’d be better off starting with a lighter color; I'd suggest the purple, cos it’s closest to the desired final color. Use the RIT color removal solution to bleach them out as best you can; then use one or more or the color solutions, and try to get as close as you can to that “Tiffany blue” color. Worse come to worse, use the color removal solution to bleach it out and start over.
If you hurry, you can score her a sweet Valentine's Day gift. Good luck!!