Scarlett later fell through a different portal than the one caused by Mirai. This portal was caused by the fates -because they absolutely hate demigods-. The last thing she remembered from her world was talking to Percy, Annabeth, and Piper. 

"What in Tartarus? Where am I?" she whispered, before walking in a random direction. 

This is my OC. Scarlett Evergreen, Daughter of Athena, Legacy of Poseidon and Aphrodite. I'm also thinking of making her a blessed by Apollo since she has somewhat seer powers and is fairly good at healing.