When people talk about "lifting heavy", they are generally speaking about using free weights, ie, a barbell and plates. And they mean the basic exercises, which are bench press, shoulder press, squat, and deadlift.
There really is no conversion between using machines to do isolation exercises and basic powerlifting exercises. They are entirely different.
A woman who was starting with this might start with an empty bar, because that would be all the weight she could handle at that point, and for her it would qualify as "heavy". In comparison with other serious lifters, a woman who "lifts heavy" might bench press her own weight, squat 1.5 times her weight, and dead lift 2 times her weight.