I think Isla was genuinely sad those were not tears of joy in any way, she started off copying Esme with the fake crying but she realised what it was and she looked genuinely upset it’s a different kind of cry.Surprise, Mila nowhere to be seen. The way Isabelle explained to Jace was so sweet I must admit.
I know she’s an innocent child but I get so much second hand embarrassment watching Isla on these reveals.