Guest post by "Being Useful" Yes. Molly looks scary. http://oi62.tinypic.com/2dayc88.jpg http://oi61.tinypic.com/ehhgl3.jpg
It may look scarier to me than to you, but, again, I admit it's also colored by my personal perception of her as a massive threat.
I still have NO idea where you get "she's so lonely" from. It seems far more like projecting than anything that's actually in the story. She comes across as an obsessive with a fetish, not someone going "I have no friends". Many people very easily go around with obsessive personalities and have lots of friends. She's never expressed that she wants or needs another friend, just that Sarah is cool for being trans, and only for that reason.
If Sarah were to answer the door one day in "boy clothes" and say "Hi, I'm Seth", the way Irma did, Molly would immediately have zero reason to continue the "friendship". That isn't "loneliness".