I see. Thank you for providing this additional information, Fornicha.
With regard to his ex's failure to sign a quit claim deed as required by the court's order, your father could file a motion for order to show cause with the court, requesting that she be held in contempt of court and even jailed until she does comply with the court's order. This usually motivates individuals to comply with court orders to avoid being incarcerated and is the usual method for enforcing court orders.
With regard to the joint bank account, normally either party may withdraw any or all of the funds from a joint account unless it is restricted in some way. In fact, spouses often do this where there is a separation or divorce is anticipated and there is normally nothing unlawful about it.
However, if divorce had been filed and she withdrew all the funds from the joint account, she would typically have an obligation to preserve the funds and not dissipate them since they represent marital assets, except she could use them to pay down marital debt or for regular living expenses. If she dissipated them, then your father could request that he be granted a greater share of other marital assets to compensate him for his loss in the marital asset.
Here is a CA court form and instructions for an order to show cause:
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