If there was anything Tiana can be during this period, that would be stubbornness getting a hold of her. In this serious situation, it didn't cross her mind that Damien had his reason for leaving without her, but would you have her sit idle without doing anything to save him andDaisy?
No!
She would be the stupidest mother in the world, to sit idle and not make a move to save her child, and that wasn't what she did when she had received an anonymous message, which she all too knew who the sender was, before she escaped without anyone knowing.
Damien would hate her for doing this, so would Andromeda, his mother who might clearly have a heart attack when she finds out that she isn't at the wedding reception with them anymore.
