Well she starts out a poor thief who has anti-capitalist sentiments but then a good hunk of bat dick gets to her and shakes all that stuff loose. Then Bane, the evil populist guy, tries to nuke Gotham because he was kicked out of the same ecofascist group Bruce was part of for being too extreme. So then she realized billionaires aren't so bad because at least billionaires don't want to watch the world burn.