I have no experience with the LCR. Like others said, let her try out a few and see what she likes. Let her handle your G23, if she likes it she may want a G19.
As for a holster for your 23, I would recommend Pure Kustom (forum sponser). Rocky makes some awesome and very functional leather. I would say to get the Black Ops. I have one for my 19/23. It can be worn inside the waist or out. It'll fit your Glock like a glove and won't budge until you draw. The mouth will stay open for one hand reholstering. This is very important in my opinion. Rocky does this without using any additional material. So the holster has a thin profile.