[@SunsetRoses]
I like the idea of wizards being able to sense magic if they're looking for it or feeling it if someone does something close enough. So if Dianna used some in Allison's presence she would take a look. She's got other things on her mind so she's not really checking.

Even if Dianna's not looking for it, though, she would definitely know Phone Freak was a mage considering the Presence just announced it to the room.