Is my daughter's maternal aunt considered her mother, and are her children considered her siblings, given that my daughter was suckled by her aunt three times to satiation at one time, and three separate times over three months?

The preponderant opinion is that what prohibits (marriage due to fosterage) is five full, satisfying sucklings. The measure of a single suckling is that the girl takes the breast and then leaves it of her own accord after suckling from it. If your daughter has suckled from her maternal aunt five full, satisfying sucklings or more, then she is considered her daughter and a sister to her children through fosterage. The separation of sucklings over months does not affect this, provided that all of them occur before the completion of two years of age.