Hi - my name is XXXXX XXXXX I'm a Real Estate litigation attorney. Thanks for your question.
If she will not simply execute a deed as ordered, this can be done, but it will take another lawsuit to accomplish it.
Since she is in another country, this is a difficult situation since her ex-husband can't file a motion for contempt and have the judge force her to sign a deed as required by the divorce decree.
However, her ex-husband could file a petition to quiet and confirm title, naming your daughter as a defendant in the case. This lawsuit would allege that the divorce court ordered her to issue a quitclaim deed, that she has fled the US without executing the deed per the court's order, and that an order should be entered finding her in default and an order should be issued granting him her interest in the house. The court order can be filed in the land records. Also, he can issue a quitclaim deed from himself to himself evidencing the transfer via court order.
If he knows where she is, he can have her served with process for the action. If/when she doesn't respond to the lawsuit, the court can enter an order as discussed above.
If he doesn't know where she is, then he can publish a summons for her in the county and state where the property is located, and when/if she doesn't respond, a default judgment can be entered against her.
Thus, he's going to have to go through a court proceeding to get this matter resolved, but it can be done.