Is it permissible to marry the daughter of one's maternal uncle, whom the mother breastfed once, knowing that they did not share a single breast except for that time, and that the mother breastfed her along with the questioner's sister?

"Prohibitive suckling makes the suckled child a sibling to all the children of the wet nurse. Scholars have differed regarding the establishment of prohibition based solely on the testimony of the wet nurse. The majority view is that it is not established, while the Hanbalis disagree. If the wet nurse only suckled your cousin's daughter once, then marriage to her is not prohibited, because suckling is not established except with five full and satisfying sucklings."