Based on my experience, doesn't matter at all when someone has good boots but is on basic skis. I've always had my own boots as an adult. I'm a woman who learned as a teen but skied very little when I was in school or working. Updated boots as needed. Rented basic skis when my daughter was learning and she got skis for free (age <6) with an adult rental fee. Didn't bother to buy good skis until I knew we would be going skiing on a regular basis. Also gave me time to get to a Demo Day to learn what I liked and what I didn't. That way I could shop intelligently during late season sales.
A friend of mine never brings his skis for trips out west. If conditions aren't that great, he rents standard skis.
At my first Demo Day I was an intermediate. Found that I could tell the difference between skis pretty quickly. It helped that I had enough confidence to try skis that were not really the right length (I'm pretty short). You might consider having your wife do a personal demo day later on in the season. Meaning rent demo skis on mountain and switch out after 2-3 runs.
Originally Posted by mtebor
I ended up going with K2 sweet luv for my wife. It was kind of interesting when the salesman looked at her boots which were done by Jack Rafferty at Snowmass last year and we were looking at rentals. We went with the sweet luv as it wasn't much more than rentals and should be a good beginner ski.
I am not sure if I should be concern that her boot is much better than her ski but at this stage I dont think it really matters.