Some spots are perfect for a bluff. When they least expect it’s a bluff is the absolute best time to try it. You can’t just assume someone has cheated you unless you can prove it.
If she was cheating it makes no sense. Calling a huge bluff with a pathetic weak hand makes it too obvious. If you have the ability to get signals from someone who can see the cards you wait for a hand where you have something to win.
It has to be just a brain fade move on her part, like she saw a pair or something.