Erma

Erma is a horror-comedy Web Comic by Brandon Santiago, about a child named Erma (who happens to be half-ghost) and her Genre Savvy classmates. Updates irregularly. Read it at https://tapas.io/series/Erma

Tropes used in Erma include:

Character Title
Crowning Moment of Heartwarming: "Silent Night"
Literal-Minded and Comically Missing the Point: "Hey, Erma, you mind poking your head in through the wall and... Okay... I didn't mean it like that..."
Oh Crap: The local boys might have Erma Surrounded and snowballs ready to fly, but that isn't good enough.
Show Within a Show: "Warrior Unicorn Princess", Erma's favorite cartoon. Clearly styled after My Little Pony: Friendship Is Magic, complete with a nickname for fans ("wupers"). Funnily enough, Erma is exactly the target demographic of the show, but considers it a Guilty Pleasure.
Stringy-Haired Ghost Girl: Erma's design is strongly influenced by this archetype.
Summoning Ritual: Amy tries to summon Erma to ask for notes. The summoning worked but we don't see if she actually got the notes.
Television Portal: Erma forgot her lunch.