Sky's the limit.
If she doesn't have one at all & wants to give it a go I think a Haydel dr-85 is hard to beat for $20. I still carry one everyday with calls that cost plenty more. Course there's not much custom about it but it's one of those everybody ought to have one.
My group has a bunch of RNTs and a couple echos and I like both those companies. I know there are a lot of "lesser" known call companies that have devoted followings I just haven't gone down that rabbit hole yet.
What kinda places will y'all be hunting? Big lakes, rivers, holes in the woods, farm ponds, etc?
I'd like to get some older calls and try sometime, olts & yentzens, stuff like that.