I'm with you on this Jon - catch and eat is way more defensible than C&R, and as I think we both agreed on the dark side, spear-fishing comes out top of the crop in respect of selective, sustainable fishing methods.
Here's a potential middle-ground for photos... what if anglers took a photo of the fish, especially of the species and sizes of fish that your daughter guides for, in the water alongside the boat. It's a clear capture, so the angler has the kudos if that's their thing, and whatever happens next can remain off camera - either a kill and chill or a release. Seems to be the best of both worlds?