I personally haven't damaged mine, but I know of some who have (also from skiing). Additionally, my purebreed golden retriever tore both her ACL and MCL in her rear leg after falling down an embankment and getting tangled up in some fallen trees. It was an expensive surgery for our pup and she has some screws in her leg which were needed to reattach and stabilize the ACL, MCL while things healed and reattached to the bone, but after 9 months she is almost back to full speed and hiking again.
It is a repairable injury, and the recuperation period can be lengthy - following good physical therapy regimes are a tremendous help in the success of the procedure and the functionality of the limb afterward. It is quite likely that a full recovery with few or no physical limitations is achievable, but patience and persistence with the physical therapy is key.
We will keep your daughter in our prayers for a speedy recovery!