8 months ago:
To answer both of your questions:
If ya'll paid attention enough towards the end, ya'll would realized that Vanilla-chan was in fact "not" dead. She was put in the E.R. for a few weeks as the doctors tried stitching her wounds and giving her enough fresh blood to live. That's all there was to it alright? Vanilla-chan didn't die.
What she did was went through a brief coma due to everything that occurred including that girl betraying her trust. It all put her in a faze. I felt like adding a good teaching moment to this one and that's the lesson- you can trust "some" people, but your true friends are the ones you need to trust more and listen to. They may very well be telling the truth- in the case of why Moca-chan got mad at Vanilla-chan; not to mention feeling overly protective and concerned for her.