I think that attempted murder should be added. Here is the reason: she is twilight's assistant. She would have known that the students would be going on a field trip to the sky. It would be an awfully big coincidence that her magic draining took effect at the same time as the students were on a field trip where their lives depended on magic. She could even arguably qualify for attempted genocide, as her actions would lead to the destruction of the crystal empire
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I don't know the exact context of what you are talking about but ponies have lost their magic plenty of times on the show, and they didn't die.
Sounds a bit like you're over thinking something that the show doesn't portray as anything but generic cartoon evil.
I also think you should just add it on the page, or ask an admin to unlock it if it is locked.