I'm not sure how this applies to a female, but to a male, I would say....
Taken from
http://www.testosterone.net/articles/214rip.html:
"So what am I trying to say? If you weren't born rock hard, dieting down to low levels of body fat isn't going to give you the look you want (by itself). It may get you lean, but it won't get you ripped. If you want to look dense and striated, you have to train heavy. Here's why:
Although higher-rep training (i.e. 8-12 reps) will "fill you out" through hypertrophy and proliferation of such things as the sarcoplasm, mitochondria, and capillaries, only heavy training (i.e. 7 reps and under) will improve your muscle density [i.e. myogenic tone (2,3,4)] through growth of the contractile proteins myosin and actin.(6,7,9) After all, the contractile proteins are by far the densest components of skeletal muscle, and causing hypertrophy of these proteins will translate into a denser, harder look… even at rest!
Another "muscle tone" benefit that can be attributed to heavy training is increased neurogenic tone (i.e. tone when movement or contractions occur) through the sensitizing of alpha and gamma motor neurons.(5) Now, although some individuals will try to tell you that increasing the sensitivity of motor neurons will enhance your "tone" by keeping muscles partially contracted even at rest; don't be fooled; this isn't possible. (1,2,3,4)"
I believe the author's correct. When I was doing an HST-style program with higher reps, I got bigger, but the added mass wasn't "dense." I've switched over to a strength-oriented 5x5 program for the past 6 weeks and I've noticed some pretty good results.