Although they knew that she probably needed some alone time, Liz and Megan understood that they needed to cheer up Jen. After all, they found out (alongside Jen's parents) that Jennifer was diagnosed with a minor case of Bipolar Disorder, which meant she could be forced into a state of depression much more easily than a normal person around her age would be, right up to the point she could possibly commit suicide if she was pushed way over the edge enough.
Sure, that didn't stop her from becoming a head cheerleader, but that was because she had really great friends and a loving family that supported her the whole way. However, from what Kyle had done, it made the depressed reindeer girl feel even worse than her occasional Bipolar episodes. So, in their best attempt to cheer their best friend up, Liz and Megan gave Jen....