TheWoWDBUsed lvl 10 [item=33154] and ownd them all with no problems. I leveled 3 ele pets, but in the end only needed one.
Humanoid
Cassandra Kaboom
Master Pet Tamer
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Try using an Elemental Pet against her, like the Phoenix Hatchling or Pebble.
Mechanical Pets are Weak against Elementals and strong against Beast.
HOTFIX OCTOBER 4th: Cassandra Kaboom's pets are now the correct level (11, not 13).
Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
Community notes from Wowhead · 22 comments
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Level and Map Tracking
The game data tunes Cassandra Kaboom for levels 10 to 30, Classic content.