Important Note: The fruit on her hat is made of plastic.
Strategies
With
Conga Zombie is a zombie with decent stats by herself, but her ability is the reason this zombie shines. Her ability can weaken a plant for Conga Zombie herself, another zombie, or a trick to take it out, or flat out destroy threatening, but frail plants such as Template:PvZHLink, Template:PvZHLink, and Mushroom Ringleader. If no plants are present, Conga Zombie can simply dish out 1 free damage to the plant hero. Additionally, Conga Zombie's ability can be mixed with Evaporate to destroy a plant instantly at a low cost.
Since Conga Zombie is a dancing zombie, she benefits from the dancing tribe. Also, since she has the Gravestone trait, Impfinity can use Headstone Carver to boost her further. However, Template:PvZHLink can pose a threat to Conga Zombie.
Against
Anything can counter this due to her low stats, unless boosting tricks are used on her. The best way to destroy this fighter is using a Grave Buster. Plants with the Armored trait or those that can't be hurt are immune to Conga Zombie's ability and force her to redirect the damage to another plant or have the ability nullified.
Peel Shield is the best way to defend against Conga Zombie's ability since it makes all plants immune to damage entirely and is cheap enough to be played on the same turn Conga Zombie is played.