Calculated Deception
Donovan wondered if it truly was an accident, or perhaps Darcy was simply that crazy.
In fact, this was a point of great concern for Chloe, too. Hence, she momentarily set aside other matters to focus on the matter regarding Iris pushing Darcy.
F*ck! Blair's right! She deliberately grabbed Iris' hand and feigned a fall because she already found out that her child was dead in her belly at that time