I believe she work exactly like fire main and Kushina habanero. She suppress immunity and cause immobile until the end of the round. The only thing that last until the next round is her chakra sealing. So if you use it on edo Minato after his standard he gonna be immobile until the end of the round and not the next round because he has immunity. On the other hand, if you use it after standard on a ninja who doesn't have immunity like kakuzu, he's going to remain immobile round 2.

Also, ninja who have a immunity buff like light main, will react to this debuff the same way Edo Minato reacted to it.

Is her sleep 100% chance like regular Itachi?