As a general rule I might suggest two to three times a week with resistence exercises. The average women does not want to look overly muscular but toned and fit. Tone is a nice way to say muscle firmness. Fit would be a way of saying less body fat, with a leaner, fresh healthy look. Something akin to the California girl look. (my personal choice would be women's Pro beach volleyball players, but that's just me)
Most women will adjust well to machine equipment rather than free weights. They will believe that BB's & Db's are too manly. Then there are the progressive women who can understand the benefit of using both types of lifting equipment. Women should workout pretty much the same way as men (8-12 reps), even heavy at times (4-6 reps). And like men, each respones a different way to each system. Where I train at we have three women (not the token type). One lock's out 400 on the bench for partials, in regular workouts and the other two about the 330 to 340 lockout range. They are ladies in every sense of the word, but do enjoy lifting to challenge themselves. Any women can train light to extra heavy and gain the rewards of BB'ing, depends on the women and how her body respones.
Cardio is best done twice to three times a week, no more a week would be required. Cardio is pictured as treadmills or running. There is also spinning, Air-Dyne, rowing machines (outstanding cardio), power walking, trail hiking, etc. Consider not doing the same form of cardio each workout. One does not have to train as a marathon runner to get in top shape. Interval training, as Tabata protocol, has a different slant on cardio and can actually give better overall results (in much less time invested) as far as fat lost and keeping muscle tissue.
Two accepted ways to manage fat lost and keeping it off. Manage the carb's or focus on whole, dense carbs. With the low calorie diets, a lot of healthy and needed muscle tissue can be losted along with the fat. Good Luck.