Revivify

While spells like Raise Dead and Resurrection specify that the target needs to not have been Undead, the spells True Resurrection, Reincarnate, and Revivify do not. This mean that a creature turned into undead can still be raised back to life with these spells. If so, I would assume the spells bring back the creature to full life instead of raise them as Undead again.

Does the “creature that has died within x time limit” parts of the spells refer to the creature in their original state or does dying as an Undead count for the spell requirement?

A Life Domain Cleric casting Revivify should be able to apply the Disciple of Life Feature Bonus to add 2 plus the spell slots level to the amount of Hit Points restored. Cast with a 3rd level spell slot, a Life Domain Cleric should revive the creature with 6 Hit Points.

Level 3: Disciple of Life

When a spell you cast with a spell slot restores Hit Points to a creature, that creature regains additional Hit Points on the turn you cast the spell. The additional Hit Points equal 2 plus the spell slot’s level.