she is the vengeful antagonist of mon-ICK-a
she is bullied by Stephanie turner, so she sends threatening emails, calls, and texts. eventually, Stephanie dies, much to her pleasure. she says how she was as "nice as a bottle of toothpaste.". ironically, toothpaste is not living, therefor incapable of kindness. so she means that Stephanie deserved to have her face taken off the earth.
MON-ICK-A 2 Edit
this time she is bullied by genny Rivera, but Brooke Davis takes the blame. through flashbacks and videos brooke receives, it is revealed that her mother committed suicide and monica died of a miscarriage, interestingly caused by Stephanie from the previous film.