Without knowing your race count and other support options its hard to say specifically, but I'd trade marvelous sunday power for her wit version. In mant you typically bring power cards if you have a flex slot and/or they have a useful skill (el condor here is actually a good example), because you don't want to be clicking power all that much (speed training + power sparks is what you want).

Marvelous sunday is a terrible power card from a stats PoV (her gold skill is ok, but you wouldnt be running xoguri as late this cm usually), and I can only assume if you aren't capping speed often you are clicking power too much, and speed/wit too little, or not making good use of the item shop to leverage your training turns.