This question is based on observation of a pivotal scene in the movie.
Throughout Rey's lightsaber duel with Kylo Ren, her facial expression clearly shows that her emotions at the time - fear of Kylo, anger over Finn's defeat etc. - are unbridled and driving her forward. Later, she learnt to use the Force as her guide, managing to strike him down. She stood over him, who is at her mercy, and she appeared to be brooding over what to do with him, with her blade still drawn and her emotions still in full display on her face. She was only interrupted when the planet started to tear itself apart.
This scene is somewhat similar to the scene between Anakin and Count Dooku in RotS. Dooku lies defeated and at Anakin's mercy. Anakin executed him in cold blood, but remarked that it is not the Jedi way, which is to show mercy to foes who no longer pose a threat.
Considering that Rey is not yet taught the distinction between the light and dark sides, much less what is and is not the Jedi way,
was Rey at risk of going the "Anakin way" - allowing her emotions to cloud her judgement, driving her to actions that treads dangerously into dark side territory, even as she stays committed to being good - and is therefore being tempted to fall to the dark side by her apparent lack of emotional discipline at a Jedi level?