she couldve just told them to hide somewhere or stay out of the way or even somehow involve them in her plan.....if they go all out against oro and kabuto, then no matter how much they see it coming, they wont be able to beat 2 sannins, 1 jounin, and naruto with just 1 armless sannin and 1 jounin

if you follow all the scenes that show her, you can tell by her expression and thoughts that she's been indecisive about which way to go all the way till the end