All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
This girl did not fall into disbelief even if she was undoubtedly wrong for what she had said. She must fear Allah Almighty and make sure that her love for Allah should be more perfect than her love of anything or anyone else.
She must avoid whispers and not pay any attention to them. She has to know that if she obeys her parents in disobedience, then she is sinful by that but not a disbeliever. She must immediately repent. If she sincerely repents, her repentance will undoubtedly be accepted, whether she obeyed them knowingly, out of forgetfulness, or out of ignorance. Her obedience to them in any case does not take her out of the fold of Islam but she must repent and not obey them again or obey anyone else in matters of disobedience to Allah.
For more benefit on the limits of obedience to parents, please refer to Fatawa 271255, 131695, and 123554.
Allah Knows best.