The following morning, Nikki awakens to find Sarah sleeping on the living room floor and large scratch marks running across the wall.

Later, Sarah spends an afternoon with her childhood friend Heather who suffered a traumatic brain injury in a riding accident.

Gary, Sarah's wealthy stepfather, learns that the car has appeared at a tow yard, as the registration is still in his name.

He brings her to retrieve it, and the tow driver reveals that the car was abandoned near a water facility in the middle of the road.

At work, her boss Joan suggests that she visit a doctor given her familial history of mental health problems.

While on a date with Darren, Sarah manically confides her belief that she is a clone and has him drive her to her mother's grave to dig her up and retrieve her DNA.

She exits through a window into Heather's bedroom and joins her in bed, but awakens the next morning to find herself back in the hospital, implying that everything since her escape was part of a dream.

Sarah takes this as confirmation of her belief that they are both alien abductees and joyfully tells her social worker that she is not delusional.

The site's critical consensus reads: "Horse Girl proves unwilling or unable to explore the deeper themes it addresses, but this unusual drama is anchored by Alison Brie's committed performance.

"[5] According to Metacritic, which sampled 17 critics and calculated a weighted average score of 61 out of 100, the film received "generally favorable reviews".

In a 3-star review: "The sincerity that Brie brings to her full-fledged embodiment of mental illness is major, and in turn helps Horse Girl overcome its tricky storytelling.