@Crystal Neighybánya
Didn’t see you put that info at the end so excuse the late response.
From what I’ve gathered, starlight motives never changed, this was just a different one.
Tackling starlight’s ideals wasn’t too hard for the writers to do because they already did it in cutie map showing that while her talks of friendship and equality was what she truly believed, her actions failed to create her end goal.
This episode was about her revenge not her ideals and even then I’ve already stated where it still shone through.
To drive my point further, consider what would happen if twi did prove her ideals wrong, what would change? Starlight still has the upper hand and she still had her way of life steam rolled by the 6. Just like with cutie map her ideals are overshadowed by her actions.