Other than that, just Shift+Click on her, select Edit In Create-A-Sim. Faster, as well as allows access to other CAS features. 
Sure, but in all seriousness, for any Sim under your control, it's just as easy to send them to a mirror for a simple hairstyle change. Cheats are often off-limits or have negative side effects. I've read on this forum that the edit-in-CAS cheat resets a Sim's age, so that is something to keep in mind.
EDIT: Also, don't you have to turn testingcheats on first? These kind of cheats can be intimidating and dangerous for a new Simmer to mess around with in a game file they enjoy playing.