She would too. And if she is awake and he falls asleep on like a book or something, she would cover him up with a blanket. "No  drugs... just relaxing stuff. Like comfort food and milk." 

And that will piss him off after the initial wtf moment. And he wouldn't know how to react to Dahlia pushing him back. Like it would stun him too and he'd not know how to react, but I'm sure Darden would say something and Dahlia would be like, "Just shut up, I'll fight you too." Dahlia is a little firecracker when she's pissed. Especially if it is because someone is bothering her Phoenix demon. And I could even see Clary being like, "Sony worry babe, I'll help you."

God that shit would be funny as fuck. But yes it would become very apparent 

Dahlia will nod. "Good to know then. I'm glad you think like that. Not many people do, especially demons. They just hear I'm half angel and glare." Shell chuckle, "okay, I think that's good then."