Is a girl who breastfed from a woman considered a sister to her children, making marriage to them forbidden for her, if the breastfeeding occurred a year after the woman weaned her child, and the milk was thin and yellowish?

If the liquid the infant nursed was not milk, then it does not establish the حرمة (prohibition by reason of fosterage) of suckling. However, if it was milk, but its color had changed, it does establish the حرمة, unless it was yellow or red water that is not considered milk at all. For the حرمة to be established, it is a condition that there be five full, satisfying sucklings.