Wonder Woman fighting Hela is going to be one nasty fight. Hela nearly destroyed Asgard and she would have won if it weren't for firelord raining on her parade. Then look at what Wonder Woman did. I believe Wonder Woman would come out on top but hey, We should watch WW84. That will give us more info about this incident.
She broke the hammer of thor with her hand and was too powerful for thor. If she fought with wonder woman HEla could destroy the sword and would just be left with the lasso.
I don't know this one. It depends on how they choose to portray wonder woman because they made her weaker than superman.