Allah the almighty says in context of talaq:
Divorced women remain in waiting for three periods, and it is not lawful for them to conceal what Allah has created in their wombs if they believe in Allah and the Last Day. And their husbands have more right to take them back in this [period] if they want reconciliation. And due to the wives is similar to what is expected of them, according to what is reasonable. But the men have a degree over them [in responsibility and authority]. And Allah is Exalted in Might and Wise. (2:228)
and later in the same context:
And when you divorce women and they have fulfilled their term, do not prevent them from remarrying their [former] husbands if they agree among themselves on an acceptable basis. That is instructed to whoever of you believes in Allah and the Last Day. That is better for you and purer, and Allah knows and you know not. (2:232)
These verses seems to say that after talaq if the spouses or ex-spouses want to reconcile the (former) husband has more rights get her back than if anybody else wants to marry her (in case that her 'iddah ends). They also leave the impression that hindering a reconciliation is a bad deed. But maybe the relevant verse applies only in case that the reconciliation is within the 'iddah.
Now i want to ask for the case of talaq or khul'a where the iddah (the waiting period) has already ended and husband and wife seem to want a reconciliation is it allowed for the guardian of the lady to hinder this reconciliation if he sees no benefit in this and fears for his protegee? More generally: Is it allowed to hinder a reconciliation of former spouses? And if so are there conditions to make it permissible?