Does a breastfeeding mother have to make up for not fasting if she feels extreme hunger and thirst, which affects the production of milk necessary for her weak infant whom her milk does not satisfy in this case? And what are the consequences for her in this situation?

A breastfeeding woman is permitted to break her fast if fasting becomes difficult for her or if she fears harm to herself or her child. If she breaks her fast out of fear for herself, or for herself and her child, she is only required to make up the missed days (qada'). However, if she breaks her fast solely out of fear for her child, then she must make up the missed days (qada') and feed one poor person for each day.