Topic updated with answers.
Margaret’s dodge + Rogue skill work just like Inari’s dodge + rogue in terms of how they activate, and the rules of what happens when one of them activates. It’s two separate rolls.
While it is unknown which roll comes first, it is clear that if the evade talent activates, no further mana gain occurs.
Margaret and Inari’s dodges do stack! What that means is you get an two rolls for dodging. It is unknown which triggers first, but one roll is to dodge and get a 
minion if success, and the other roll is to dodge and get mana.
Furthermore, Hatter’s steal is treated by the game like a debuf, and thus, Margaret has a resistance to getting her dodge buff stolen by Hatter (but her allies will still get it stolen).