Not without examining it (at least visually) to determine the model.  Which the ease of might depend on how you want to approach/interact with the force field area.  Though she'd know that many are simple and basically disposable.  The sort of thing you find in survival kits or attached to suits of armour.  The ones in the hallway are probably higher power and more expensive, but unless they were built or modified specially they wouldn't be expected to have alarms.