Re-marriage before acceptance of Khula
Khula (annulment of marriage) is nothing but a demand for divorce from the lady and as long the husband does not accept it either in words or writing, it is not affected. After the Khula, she can marry someone after the Iddah (mandatory waiting period).
Thus, the Nikah (marriage) performed without waiting for the acceptance of the husband is not a marriage at all, but a great sin and adultery. As given in Mausoo’a Fiqhiya, which was published from Kuwait.