[@Pathfinder] I don't see any particular issues with this idea. Perhaps you could have them be able to manifest their bodies with lots of energy but they still wouldn't be visible or recognizable to those that knew them prior to being cursed? Just an idea to mull over.

[@Conscripts] You're good to go, sorry I've been at work all day. Only got on for a few minutes on my break.

[@Shard] Your character is good to go as well.

[@GodOfWar] The only issues I see are that your shape-shifters are basically Lycans with mating marks. Shape-shifters' animal forms are the same size as the real animal. So a wolf would be the same size as a wolf in nature. Also, your character would not have mating marks because she isn't mated, females don't get theirs until they meet their mate. After which they only receive the outlines and it colors in the more contact they have before finally completing at the mating ceremony. If she was mated, her mate wouldn't let her out of his sight for more than an hour or so at a time, in other words no school. Aside from that, mating marks are utterly unique and vary from couple to couple, shape-shifters do not pick their mates either. They're incapable of reproducing with anyone other than their true mate. That's why I mentioned above that your idea is essentially a Lycan. Lycans always breed true and can reproduce with nearly any species though most commonly either humans or their own kind. If you swapped over to a Lycan and turned the mating marks you've listed into ceremonial/traditional tattoos I'd be happy to accept. I hope I don't sound like a picky asshole lol I try and be overly clear so everyone is on the same page.