I think fitday may not do body fat because it is very difficult to measure accurately. I think the most accurate involves being weighed underwater and determining your density. Often considered the gold standard, but really inconvenient.
Many people end up using calipers (a skinfold test), but this measurement can be flawed due to human error.
Tanita scales use bioelectrical impedence, which pass electrical impulses through the body and measure resistance. They can be affected by hydration levels, among other things...
Also, it's notoriously difficult for women to build a lot of muscle mass!
But you're right -- changing our body composition is important!! When I first started weightlifting I went through a 3 month period where I lost no weight, but went down a dress size! That's how I knew something good was going on!!
My 5 C's of healthy living: Commitment to conscious control, with the understanding that choices have consequences