Twists.  The super-shrinky, super-cute wet-set ones.  She can rock them down, or up in a bun or pony with cute cat ear or pom-pom headbands.  She can jump in the ocean or pool, with no worries.  She can get dressed in the mornings with zero effort-- hair did, and posh uniform?! Easy button, baebeee!  They're also easy to keep moisturized, re-twist when frizzy, and detangle on wash day.  Note: I twist with the next wash day in mind, lol -- doing medium-sized twists, only! That way, take down (which is once a month, usually) is breezy.