I think that encounter was a Stalemate. Between Galactus and Dark Phoenix.
That was a weak Dark Phoenix and a weak starvining Galactus.
I think WCP is above galactus.
WCP is up there power-wise. But her limits are yet to be explored, which I wish writers wouldnt be so afraid to write and explore.She could give us glimpses of what life is suppose to be about. What turns a little kid into a killer? Why we do what we do? Why did a part of her had to experience being a human before she could become whole again? I doubt a Marvel Comic writer would want to go that deep.
Basically she's a life force and starts and ends life. Burns away what isn't working. She has been seen to hold time lines in her hands. Is she beyond a god because I would have expected her to show up in Chaos Wars but maybe it would end too easily if she appeared.
This is why I think she is above Galactus.
But I still think that Mad Jim Jasper is above her.