I don’t know the OPs circumstances to say whether it’s worth it over the essentials, a 12 year old novice skier doesn’t really need wicking base layers on a first ski holiday, it’s the whole point of layering to stop you sweating and they’re not likely to be hucking it off cliffs or hiking backcountry.
I disagree. Beginner lessons are often the physically hardest. You spend much more time picking yourself up, and use a lot of energy moving inefficiently. Meanwhile, the feeling of being wet and cold is a great way to ruin the fun of the experience.