Mirriam is going to look for hostile commlinks, then try to hack them, then try to mess with them.
She's basing her searches off of Rita's location.
Initiative:
20If the enemy is running silent, she makes an attempt to find their commlink:
Matrix Perception:
1 Hit vs their Logic + Sleaze (Protip: Commlinks don't come with Sleaze, so it's just their Logic).
Choose a random occupant's silent running commlink from the car (or vicinity, if you are feeling particularly cruel!) and that's what I'm spotting.