Why is Sheila Birling likely to become a feminist?

I actually do not see Sheila as a feminist. I see her as someone who has learned a lot about social inequality and ignorance of the world around her. I believe that Sheila will be more solicitous of the working woman.... and that she will change the way she interacts with those less fortunate. I do not, however, see her carrying a sign in support suffragette movement.... though I do believe that over time she will sympathize with what they try to accomplish.