There is no Spoo.. Slow.
"Sleepy Trouble Bubble
Cost: 80 Mana
Range: 800
Causes the target to become drowsy, then fall asleep. The first source of damage that breaks the sleep is doubled, up to a cap.
Dropkick a bubble that deals 60/100/140/180/220 (+40% Ability Power) magic damage, lingering as a trap if it hits nothing. The bubble's range is extended when flying over a wall.After a delay, the victim falls asleep for 2 seconds. Attacks and spell hits break sleep but deal double damage, up to 60/100/140/180/220 (+40% Ability Power) bonus true damage.When an enemy falls asleep, Sleepy Trouble Bubble's cooldown is reduced by 10/15/20/25/30%."
No Slow to be seen here. So there is only one CC effect and that is the delayed Sleep (not Stun, you won't wake from Stun by getting damaged. You wake up from the Sleep.) So Morgana Shield must be there to stop the initial hit to be able to block the sleep from affecting the target.
Edit; but when watching video of Zoe E, it apparently does slow the target by the end of the drowsy effect. I hate it when people are lazy with their description. Sorry about that. It seems to be quite short slow though (quarter second maybe) before the target goes to sleep. Hardly a separate effect in my eyes, but I am just one of the anynous regular players.