Board Thread:Skyrim/@comment-104.186.53.42-20150909052246/@comment-6881629-20150909101625

If you do enough damage to a follower they will turn on you otherwise no idea, you could try a calm spell but you'd need to skilled in illusion or if you have it the Bend Will shout. Theres yielding too but its a bit unreliable. If your on a PC open up the console click her and try the command -

stopcombat

She might stop after you knock her down to her knees (attacking after that can kill her though), if all else fails reload a save before she turned on you if you can.