Why is May especially skittish about having the abortion in the story, Shepherd's Bush, from the collection, London Transports?

Abortion is illegal in Ireland, so she flies to London. By all appearances, many Irish women do the same. May fears that her moralistic friend Celia will try to talk her out of it, but Celia says nothing. The two sides of the argument are dealt with in summary, not being allowed to overwhelm May's story.