The aunt acted in good faith, reasonably assuming the children's dietary flexibility extended to family. The sister provided no prior notice, leaving the aunt scrambling to feed her nieces. It's unreasonable to expect the aunt to adhere to strict vegan guidelines under such spontaneous circumstances. The children were happy and healthy, and no harm was intended.
The aunt disregarded the mother's clearly stated dietary preferences for her children. The excuse of 'no notice' is flimsy; a simple text could have clarified the situation. The aunt prioritized her convenience over the children's well-being and the mother's wishes. Her actions undermine the mother's authority and the children's adherence to their vegan lifestyle.
While the aunt's intentions weren't malicious, she should have made a reasonable effort to confirm the dietary restrictions, especially given the relatively recent adoption of veganism. The sister, however, bears significant responsibility for dropping off the children without any prior notice or clear instructions. Communication is key; both parties could have handled the situation better. However, the mother's reaction seems disproportionate to the offense. A calm discussion would have been more appropriate than an angry confrontation.