Does the problem that occurred indicate that things are difficult and the marriage will not take place?

The reality of istikhara is entrusting the matter to Allah so that He may choose for His servant what is best, and its outcome is determined by the success or failure of the matter. What happened with the suitor's wife is attributed to the husband and his decision, so if Allah decrees your marriage, it will happen. There is no harm for a man to marry a second wife if he is able to be just, and his wife has no right to object unless she stipulated before the contract that he would not marry another. It is not permissible for her to seek divorce merely because he desires to marry another. The mother's joy at the suitor not coming is inappropriate; the original principle is that the mother should strive for her daughter's well-being and marriage. The mother has no right to prevent her daughter from marrying at all, or from marrying a suitable person, and obedience to her in this matter is not obligatory. If marriage with this man does not occur, then seek help from Allah, then from your righteous friends or relatives to search for a righteous husband. There is no harm for a woman in this pursuit.