I obviously can't speak for your wife, but I'm relatively new to trad archery and archery in general. With all the great, reasonably priced bows out there I would say don't go for the big dollar bow up front. I've gone through half a dozen, all of them used except my Lost Creek. What I thought would work best for me turned out not to be. The ones I have now all work well for me and I'm glad I waited a bit before ordering my Lost Creek. I tried the 55# stuff and found that 50# is my working limit.
Having said that, and much as I wish I could haul back a 65#er like the big boys, my lightest, 40# bow is a joy to shoot and will shoot through anything in Michigan if the angle is right and the broadhead sharp.
As much as you've been around this gang, I would think there will be ample opportunities for her to try a bunch of stuff. Then go for the high dollar, "I'm going to keep this one forever" bow once she sees what really rings her individual bell.