I know there's a point where you have to say the heck with it and let them be a chicken too. If you could somehow get one of those small pet fences just to keep her in the grass. Take her out early morning and at night so she isn't out under direct sun at least. I kind of feel bad that mine never get out to play.
As for keeping mine clean... I go through 11 bags of wood shavings every 1.5-2 weeks. I rake on a daily basis and get the major stuff out. When it gets to the point where they get crap sticking in their feet feathers, I strip the pens.
Stay away from any of those whitening shampoos that are bright blue or purple. I know they say to rinse it off really quickly and you'll be ok. I have turned an entire chicken purple before. Even if you barely touch them with it and rinse right away, it still seems to dye the feather shafts immediately. I have had a major judge call me out on that once. Vinegar rinses do help for just stripping any leftover soap on the bird and will give them a healthy shine to the feathers.
There are a couple other products I resort to.... There is a really cheap dog shampoo by Hartz made just for whitening. Its in a clear bottle and the shampoo is a very light lilac color. Works pretty well and its only like $3. There is another horse product called Cowboy Magic Green Spot Remover. On the spendy side, but a bottle lasts forever and works awesome. I have had some people say they use glycerine in the bath water. Never tried that myself.
As for your pullet, she is really nice! Good toes, crest, comb, skin color, nice short back, foot feathering, etc. My only concern is her wings. I battle this myself and I think it goes along with breeding these long downed birds sometimes. See how she don't hold them tight to her body. The primaries are supposed to be folded under and held level next to the body. I'm going to refer to one of Nikki's articles (with pics!!!) for this one.
http://www.hattricksilkies.net/articles_split_wing.html Check it out. I still would use her for breeding and if see if she passes it on. Just make sure the rooster has very good wings!
Amy