You are still limited to 5d6 total ini. That's a hard cap you can't surpass even with drugs.
Biofeedback will deal stun (cold sim) or physical (hot sim) whenever you deal matrix damage like with a data spike. It will do nothing as long as the victim is in AR
Frig's WIL is 5, INT 5 and LOG 6, Commlink has a Firewall of 7,
I'll leave rolling her defenses to you, but she most definitely will go Full matrix defense once she notices an attack and than turn the commlink off and restart her deck to form her persona there.