Ruju For Divorce Before Rukhsati
If the iddah period has not passed then rujoo can be done, however if it has passed then a new nikah can be performed. This assumes that the husband gave the tallaq out of his own free will.
My previous response was in accordance with direct consultation with Hassan Ilyas sahab regarding this issue. I spoke with him again, and following is what he has explained: If an intimate relationship was established between the man and the woman then the iddah period will be three menstrual cycles. During this time rujoo can performed and no new nikah is required. However, if an intimate relationship was not established between the man and the woman, then there’s no requirement of iddah. In that case a new nikah can performed.