There is no offense:

if she is aiming at something beneficial; if she is aiming at giving a teaching; if she is aiming at giving an instruction; if she is insane; if she is the first offender. The third training rule is finished.

Theravāda Collection on Monastic Law The Nuns’ Analysis The chapter on offenses entailing confession The subchapter on monasteries Eating more after refusing an offer

Origin story At one time when the Buddha was staying at Sāvatthī in Anāthapiṇḍika’s Monastery, a certain brahmin had invited the nuns for a meal. When the nuns had finished and refused an offer to eat more, they went to their respective families, where some ate and others got almsfood and left. Soon afterwards that brahmin said this to his neighbors, “I have satisfied the nuns. Come, and I’ll satisfy you, too.” “How could you satisfy us? Those nuns who were invited by you came to our houses, where some ate and others got almsfood and left.” That brahmin complained and criticized those nuns, “How could they eat in our house and afterwards eat elsewhere? Am I not able to give them as much as they want?”