I think Juls only calls Val ‘Valentina’ to her face when she’s kind of annoyed, like when Val came to the house before the breakup and Juls was calling after her as they were walking to the SUV but Val kept ignoring her, so then she used her full name. It’s like when Juls is annoyed with her mom and she called her Lupe. It’s so cute, the way Barbara brought Juliana to life was so perfect.

Heh, yeah, she does do that with both Val and her mom. Annoyance or urgency. Same with Val, frustration or emergency, “Juliana!”

I love every diminutive and intonation, there’s always a reason for every usage and emphasis.