It appears she's got a lot of muscle and lean tissue. Yes it is. Stick to body composition if you want a good and true measure of your health. You can get bad information and it all depends on who takes it and how. Body composition technique is a trained skill.
Someone has to practice over and over on several subjects before they can accurately give results.
Doesn't mean it always happens that way. Bioelectrical impedence depends on your hydration status, body type, and in many cases measures only a section of the body. If this is your only option you should keep in mind that your values could be off and not completely accurate. It doesn't require a skill of the technician. Underwater weighing, which is the most accurate, was originally done with cadavers because they were the only ones that could expel all their air under water.