Artemis (or A as she prefers it) is one of the members of the survival group in the In-Between. It isn't clear for how long this group has existed, however they have been living in their current house for months and have shared at least one other one, which suggests that they have been together for a long time.

She tried to commit a suicide 7 years ago. When that didn't work out she ran away from her girlfriend Norah who presumed she was dead..