Secondly, depending on how the contigency was written, she should have backed out of the sale as soon as the first appraisal came in....that was likely her legal right and she should have exercised her right to void the contract right then and there.
The contingency was a "subject to financing contingency" and at the point that the appraisal came back, CW did not turn down the loan but immediately ordered another appraisal. My daughter had no choice, on advice of counsel (her counsel not CWs or the broker's), but to allow this.
I have always contended that lenders in such a scircumstance (in control of the closing by virtue of their power to decide how the contingency of the sale agreement is fulfilled) breach a fiduciary obligation to the buyer in such situations.
The lender cannot decide how the contigency or whether the contingency in a contract was met, (apparently they can and do, honest, I did not make up this story) that is a question of law, which your daughter, unfortunately for her, declined to pursue, as I think as soon as an attorney had gotten involved in such a situation, the parties involved would have changed their tune very quickly and she would have been allowed to walk away from the contract.
Again, an attorney did get involved and it didn't turn out as you suggest.
In any case, your daughter's case, where the lender apparently actively conspired with the real estate broker to manipulate the appraisal process in a deliberate attempt to affect a contract is a completely different case from the OP, where, apparently, the lender did nothing more than order an appraisal.
By the way what the lender and broker did in your daughter's case has nothing to do with fiduciary duty. The tort committed (assuming that your statement of the facts of this case is correct and that the 1st appraisal was credible appraisal) by the lender is called intentional interference with a contract, or, depending on the exact circumstances involved, just your garden variety fraud, committed in a conspiracy with the broker.