Not planet obliterating as I hoped she could be, but yes, significant all the same. Of course she could wipe out all life on a planet with just her nuclear egg rapid firing while she was in orbit above it. That would be the quickest way due to the longer antimatter reload speed, which would be overkill but not overkill enough for worldwide destruction in a single blow.

EDIT: The power would have to be upgraded to around 100,000,000 mt to destroy most life in a single go.