One thing I really appreciate about Isa Briones' acting in the Pitt is that its very nuanced. Its all in the details.
Santos is not necessarily loud but she is not afraid to speak up. She's confident and has a strong sense of justice. After only knowing javadi for a little while she was already calling her "crash" and when she suspected child abuse is was halfway ready to go war for that kid. Trinity isn't scared to say what she wants to say.
However, even though trinity is very capable of expressing herself, when she's hurt she gets quiet or angry. Trinity doesn't bust into tears, she doesn't make a scene, you can only tell by watching her face change. Its the small details that make the changes and that's so important for Trinity, she communicates non verbally.
Isa Briones understands Trinity so well and can act her so incredibly, its a shame she wasn't nominated for the Emmy's this year. I'm genuinely surprised cause I kind of expected her to be.