Well Her power is controlling time itself so i don't see why she can't do something like that
Also Sorceress and their powers are the same thing.
Ultimecia can't be a sorceress without her power.
Passing through object is definitely her own power because edea's power is ice based.
Life or Death are irrelevant when you can control time and space. For example she can send the magic "life" through time to herself in the future when she died to revive herself.But that's kind of stretching it a bit.