Have you ever tried Katz Lab and fought Smogger at the end for this very rare pet?
If so you know that typically you have one shot at getting her per time through the instance. A friend Grace Dragonrider tipped me off on how you can fight him twice in the same instance.
The trick to this is that if you kill Smogger himself first BEFORE the minion then when you kill his minion, Smogger will return in a moment for a second time giving you two chances to get the pet.
And if the rare green fairy isn't enough to tempt you to try to get her she comes with a fairy card that can heal you or other team mates.
Let me know if you have any success with this tip.
Happy Smogger hunting,