pretty sure either a hack or a bug

so i was in the enemy jungle waiting for this poppy jungler and when she finally shows up we scuffle a bit before she retreats well i go after her and we are alone save for the ryze thats coming to help me im in the bush between red buff and mid lane when she uses flash to jump over hoping to escape we fight in a bush where i have plenty of health and she stuns me does her rediculous burst dmg and i die then she straight up disappears from the bush that ryze happened to be in when i died so my question is she had no flash no dash how the hell did she disappear