In any negotiation, the key to getting the best deal is to conceal your neediness. If your counterpart senses any desperation, she will make you pay dearly for it. And why shouldn’t she? You would do the same if the shoe were on the other foot.
First of all, never believe her lies. Am I calling her a liar? Are you a liar for withholding your vulnerability? Don’t concern yourself with such labels. This is strictly business. You’ve both entered into this transaction knowing the other party will act in their own self-interest. Look for patterns in her behavior and watch out for inconsistencies. Do not be fooled by claims of innocence; they will pass between her lips easier than a slice of ripe mango. You must draw your own conclusions and trust your own judgment.