The strongest survive
Gabrielle knew what would happen today before the day even began. She had seen it the very first day she met Camille.
She sensed the male alchemist break free from Camilla. She sensed her running after it and it getting closer and closer to her area. As soon as it crossed over her terrors had it and he instantly stopped for a second and turned and quickly ran straight to her.
In many ways Gabrielle was a lot like Stephanie. She did not enjoy the suffering of others but she did find watching it to be rather interesting. Her terror caused Camille's, well now Gabrielle's, alchemist to cut the top of his own skull off, walk to her and politely wait while she ate his brains.
She could taste the quality of the brains and she knew that Camille had saved the best for last. She had already experienced the gains from eating the optic nerve so she quickly ate that as well, but she took it from inside the skull, essentially destroying the eyeball.