Tristan didn't want Zhen-Zhen to stay up late. Since she's pregnant, she needed to sleep early.
After playing the last round of the board game, Zhen-Zhen and Tristan said good night to Andrew and Alveena.
They proceeded to their room. Upon entering inside, they heard Pam-Pam's meowing voice.
"Meow! Meow! Meow!"
Tristan and Zhen-Zhen smiled as they saw Pam-Pam. When FaMo got sealed inside the crystal, Pam-Pam continued staying in their room, just watching the frozen fireball inside the crystal.
Zhen-Zhen and Tristan assumed that Pam-Pam could understand that FaMo was inside the crystal, that's why she kept on staring at it whenever she was inside their room.
Pam-Pam ate dinner with them in the dining hall. After she was done, she went back to their room to check on FaMo.