Should Mrs Johnstone have given away her baby?

Around the start of the play a Gynaecologist visits Mrs Johnstone, who is expecting a baby, and tells her that she is going to have twins! Mrs Johnstone already has seven children and can't afford to feed more.

Mrs Lyons can't have children, and her husband doesn't want to adopt, so she tells Mrs Johnstone to give one to her. Mrs Johnstone is reluctant at first but is then persuaded.

Mrs Lyons tells her husband that she go pregnant just after he left to work, she would have the baby just before Mr Lyons came back, as he was gone for 9 months. Mrs Johnstone told her kids that the other twin had died at birth.

The problem was that Mrs Lyons now wants to get rid of Mrs Johnstone. She fires her from her work.

Mrs Johnstone shouldn't have given away her baby in the first place, but you can't blame her because she was told that she would see Eddie every day. It is also Mrs Lyons fault because she should have not begged for the baby and Mrs Johnstone was forced into it in the end.

What do you think should she have given away the baby and, if not, whose fault was it in the end?