What you probably want is a cotton knit. You can often find those on Lands End.. would she wear shorts to bed or would she wear a drawstring pajama bottom? I have found those online and even found some at Target last week.. though some of them weren't knit. Check out the ones on lands end. really lots of style .. the cotton lycra will prevent them from shrinking

Sounds like you want to look into the microfiber type pajamas. It's similar to the dry-fit athletic wear that is oh so popular right now. Here's some info here about the wicking sleep wear http://www.coolsets.com Just an fyi - I've never ordered from them so I don't know what their quality is like. It's just to give you an idea of what to look for. If I remember correctly from one of your other questions you're from the Washington area... you can see their stuff at a local retail store here: http://www.coolsets.com