Wrong.
It shows she didn't need them FOR THIS FIGHT. And even that is debatable, since she could well have lost had she been the one ambushed instead of her men.
By your logic, she steps on a bug and goes "oh what, I could do this by myself? Guess it's time to ditch the troops!". She took them with her for a reason. Just because THIS FIGHT didn't require backup doesn't mean she never will or never wants any.
To jump immediately from "it happened in this one circumstance, therefore it'll always happen" is idiotic. Doubly so because she quite clearly DIDN'T just go "oh you want to leave? fine, I can do this myself anyway" when they threatened to leave.