She is too thin and will probably have health problems later in life (i.e. Osteoporosis).
Can I assume from that, that you've never seen her apart from that one photo? Do you know who she is?
You say "To have true fitness"; for a simple soul like me could you define what you think "true fitness" is?
You also seem very centred on just one method yet there are many very fit people who would regard lifting weights as just a very small part of their fitness regime.
A top marathon runner like Paula Radcliffe, the world record holder, maintains her fitness mostly by road training, not lifting. She runs around 140 miles a week (reduced to just 70 miles a week when she was 7 months pregnant), much of that in the Pyrenees mountains, each session followed by an ice-bath to help her muscles recover. Is she "fit" by your definition? What's your time for a marathon?
Darcey Bussell, mentioned earlier is a big advocate of pilates, as are many other dancers, which tends to involve those "pink" weights you despise. Now as you'll know "Those who can, do; those who can't teach." so you'll excuse me if I'd put my money on her any day before any unknown "fitness trainer". Fitness for a professional dancer is a little different to that required by an Olympic weight-lifter.
At the other end of the scale a man I know in his seventies ran a half marathon a short while back and still regularly plays tennis. He's never lifted a weight in his life but still has amazing fitness for his age.
Many people also keep fit by playing squash or similar sports which they find a lot more fun than sweating in a gym lifting weights which probably requires a degree of masochism to enjoy. I hope you wouldn't encourage anyone with high blood pressure to lift heavy or you could kill them off.
So what I'm suggesting is that if you want to be a decent fitness trainer shouldn't you be widening your horizons a little and recognise there are "courses for horses" so you can give your clients the best and most appropriate advice whatever their needs or abilities?