Been in that same spot with my own family secrets. Honestly, there is no clean answer, the damage happens either when you lie or when the truth comes out. What matters more is how the mom handles the fallout after the kid finds out. That anger from the daughter is the real test, and it's way harder to fix than the original lie.

Setting hard rules like that seems risky for someone living on the road (what if an emergency comes up?). Constant connectivity is part of the deal if you want to keep that life going. A better method is taking smaller, planned breaks during the week instead of locking away your main tool for days. You can miss important messages or lose a client's trust by being totally offline.