No; the risk is too great.
I don't like it.
Eh, I don't really want to see that.
No, she should find another way to put food on the table.
Yes; she had to take action for her daughter's health.
Yes -- the airline needs to think about the safety and comfort of all passengers.
Only if she does it discreetly, under a blanket or nursing cover.
No, co-sleeping is not that risky.