As she watched Piper, Shiro, Leo, Keith, and Lance fall, Hazel screamed, already knowing their destination.
She wanted to cry.
She wanted to jump in after them.
She wanted to slice Teresa down the middle.
Hazel knew, when she heard Teresa shout "Go where the gods cannot follow" that they were doomed, and that she wouldn't get there in time to save them.
Now the 5 of them were wandering Tartarus, the place Annabeth and Percy still have nightmares about.
She had waited by the kids when the Police showed up for Teresa, and taken care of any legal business. They only thing she couldn't explain, however, was the army of kids.
After the police had left, Hazel had walked back to Camp Half-Blood. Without realizing it, she had dragged herself to Bunker 9.
She only broke down once she saw Nico waiting there.
"Hazel, there was nothing you could have done," he said gently.
"Yeah, like with me and Annabeth. There was no way to stop it," Percy said.
"Besides," said Annabeth, "they're all tough. They'll survive and find a way back to us."
Hazel didn't know how that would happen. She knew they were strong, and that they could handle themselves. It was getting them out of there that she worried about. Percy and Annabeth has closed to Tartarus side of the Doors of Death. How would they escape?
But Hazel knew by now to have faith in the gods, whether they were terrible parents or self-interested jerks. She prayed to Pluto: prayed that the Doors would show up briefly, just for them.
Wait it's over already
I know this one is freakishly short, but it's only some kind of epilogue thing. A way to see what happened after they fell.