I say murder/suicide. Snowcatcher could not live with fumes any longer but neither could she just leave her cat to suffer. Using her magic (She is a unicorn after all) she tied up two ropes and hung the kitty first, crying and saying everything would be all right while she did it. After that she jumped, regretting what she had done only after it was too late to stop it.
Retrieved from: http://fillydelphia.tumblr.com/post/
4921363780/is-there-a-black-version
-of-the-rainbow-dash-csi-miami