well from the amount of her army wiped out, she also had no defense for the army of the dead

it was collective fighting.. if she doesnt travel North to "sacrifice" her army, then the night king only grows stronger by the time he goes south to wipe her out in hours
She risked as much as everyone else risked.. her losses arent anymore than anyone elses.. if anything the Giant's going extinct is the biggest loss so far in the show, from a humane stand point because theyve been around longer than anyone and died fighting the same war
"ungrateful" shes ungrateful if anything because her entire story arc was based on Freedom and "breaker of chains" but is requiring Winterfell to bend the knee when they said they would prefer to be allies but stand on their own with no king or queen
I really hope you dont apply this kind of line of thinking to every day life and its just stanning that has you viewing things like this..