Which is a prefectly reasonable expectation here. I would have felt the same.
In Africa however, this situation comes up when the mother is dead, or has health compromised in such a way that her body no longer produces milk. One of the images I have seared into my brain is a starving child trying desperately to breastfeed of his dying mother. In impacted areas in Africa it's not a choice of formula, pumped milk (whose buying the pump, bottles and nipples), it's a choice of life or death.
Yes I realize that, I wasn't making reference to what Selma had done, or should have. I was just speaking directly to the pp about her situation.