Guest post by "Being Useful" Loneliness isn't indicated. She didn't go "oh, we could be friends" after meeting Sarah, she went "OMG, A TRANNY!" the second she learned one existed near her.
Penny we can understand the pain and feeling for, she's acting out because she has no love or support. Sarah is easy to blame for her problems, and Penny, being Chuck's sister, and Chuck, being Sarah's former good friend, likely feels somewhat betrayed by the fact that this person who she's most likely played with before is either lying to her and her brother now or was lying to them before.
Molly, on the other hand, clearly has enough parenting going on to know what a transgender person is, and she's taken it to an extreme. It's like finding a really shiny rock or a cool new toy. She doesn't seem to think of Sarah as a real person, but rather some sort of new toy. The hate for Molly is generated by that fact in a two-fold way: Firstly, she's treating Sarah as an object/play thing, rather than another person; that's rather upsetting and offensive by itself. Secondly, when children grow bored or upset with their toys, they tend to break them, so we're just sitting here, waiting for her to do exactly that: Break her new toy.
So far as "we haven't seen her playing", well, we haven't seen many of the children playing. Do we assume they're all lonely? We've met less than a dozen in a social setting that's indicated to have hundreds.
Molly's a bit of a spoiled brat(she can afford to get shinier/better costumes than Sarah, whose mother is a VP at a bank!), and we're just watching with bated breath as she looney tunes her way through this.
