I think Phil may be right about the gaps in the gears on a compact Snoop. If your friend is doing Alpine climbs which are more gradual she may be more happy with a wide range of gears, but with not too many large gaps. In my audaxing days I used a 53/42/30 with a 13 to 26. Perfect for all situations. As for the benefits of using carbon I am not sure. But that is because I am tight
Having just looked at some of the prices, not a route I would choose to go down. There is also the commonly held belief amongst some cyclists that there is usually more weight being carried by the rider than on the bike. But I will let you tell that to your friend