If you’ve got written instructions and you’ve followed them, it’ll come down to your word against hers about any verbal updates – not a good place to be. I’d make a point of sending her an email any time she changes her mind, asking for confirmation as it’s clearly different to what was previously asked for.
Speaking to a rep (assuming you have one) wouldn’t be a bad idea, either. Recording the conversation sounds pretty dodgy though, I’d avoid that!
Pretty much it your word against hers and they will generally go with the managers word. You ned to manager her now. Get all your instructions orders in written form and any changes amended so in writing – if she wont furnish them to you email her back and have a tracable trail to follow.
You’ll either find she gives you one email and lays off you or starts to snow herself under micromanaging you. Talking to a rep is not going to hurt at vall but dont mention it to co workers /managment. I fouy feel it warrants it keep a log/diary of the conflicting instructions etc.