It's extremely difficult for a woman to get "manly" muscles.... they certainly aren't going to sneak up on her by accident, increasing her weights a bit and in the morning, Popeye-arms? No.
People look at female bodybuilders in competitive poses and go "oh no, I don't want to look like THAT!" ... but no worries, you WON'T. These competitors (talking about the "natural" ones, that have acquired "manly muscles" without resorting to a Lance Armstrong diet), don't even look like that when out of competition. Prior to a competitive event, bodybuilders (male and female) will shed as much body fat as possible... will dehydrate as much as possible... and will apply bronzing colour to their skin. And then they "strike poses." All of these things are done to highlight emphasize and define their underlying musculature in order to be judged. There is absolutely NO WORRY about "ending up looking like that" from doing routine strength workouts!
Incidentally, if she can do 20+ reps per set, the weight is too light and she will benefit from bumping it up.
Goal 1 - break 200 (46 pounds lost)**DONE**
Goal 2 - leave obesity behind (BMI 29.9, at 185#) **DONE**
Goal 3 - BMI = Normal (154# or less)
| current weight: 176.0