Zaku_Zelo said: But she could read Tenshi's mind and tell that she had nothing to do with this.
It seems that she did.
Satori said: But that celestial girl said something I'm a little concerned about. She never sent the peaches to the surface, or something like that. There wasn't any falsehood in the voice of her heart, but it was such a hasty dodge...
Yeah Koishis powers kinda a bitch to since not only can satori not read her mind, but others never ever remember seeing her or even notice her really. So yeah there would be no way to realize she was involved unless she herself said so (Which as we read, she did...Sigh frekin koishi...)