"My daughter is allergic to eggs, it's the most common allergy according to our allergist, more common than nuts," one woman wrote.
"One of my daughter's friends from kindy was allergic to so much that even if someone touched a nut or egg and touched her she would come out in welts," added another.
Others branded the mum "irresponsible", before she hit back to defend the lunch choice.
"They have implied I don't care about allergies which isn't the case," she wrote in the comments section.
"My daughter also love almonds but I don't send those or peanut butter sandwiches because of the allergy risk.
"There isn't an egg issue in my daughter's kinder [kindergarten] if there was a serious issue I would never put a child's life at risk."
Many defended the mum's lunch choices, adding that they didn't see any issue with it.
In Australia, one in 10 young kids have a food allergy. Cow's milk, eggs and nuts are the most common food allergens.
