By 'reverting to type' do you mean joining the Cabal? And if by 'reverting to type' you mean 'evil' and 'un-nuanced' then...no. That decision ended up not being 'reverting to type' so much as 'her taking the same kinds of extreme measures needed to protect mutantkind from extinction'.
As much as Scott had to go the extreme measure of creating X-Force, she decided to wade into that pit of vipers so that mutantkind can have a place on the table and ultimately to spy on and betray Osborn (see, Utopia).