When they fought in Inferno, Maddie had full access to her mutant powers plus the sorcery which added more and amplified them. Jean was crippled and only had her TK. They werent on equal level bc of Jean's status quo. They later fought in X-man 25 and I think they were more at similar levels. If Maddie seemed more powerful its bc she was out to kill and was using her full power whereas Jean fought more defensively and wanted to calm her down
They seemed more equal and had a standstill until Nate was able to seperate them
She had the chance but she said f--k all of them bc she still had a bone to pick and wanted to kill them all. Resurrecting her is a liability and there is a growing population of 200K+ other mutants to consider. Maddie simply isnt worth the risk she. poses to the many innocent lives she has already outright vowed to destroy. This doesnt make Krakoa hypocritical bc Maddie can be considered a war criminal and I dont think there is anyone on that island that has vowed to take Krakoa down that was accepted with open arms there