Thanks for the large selection of designs! See my overall comment that I just added about overused design elements of "pointy man" and "ubiquitous swoosh". That's why I eliminated #24, 26, 27, 28, 29.
#25 has nice simplicity, albeit it won't make #1 with pointy man as the symbol. If you could come up with a fresh concept for the symbol that is moderately feminine we might have something here.
#11 (and similar iterations) is promising, and I used a similar idea in our current temporary logo with "THIN" being thin. I accentuated that by going to a lighter but similar font and reducing the tracking as well. The symbol for #11 is interesting - it does look kind of feminine, and it does look kind of thin. You're close, but for some reason I can't put my finger on, it doesn't quite do it for me.
#16 symbol is nice and simple but looks generic. #20 "THIN" actually looks fat being squeezed like that. #19 looks industrial. #12 is just meh. #9 is swishman that doesn't look very thin. #17 looks top heavy and about to fall down and smack his head.