This fight gets very messy if the adds are not immediately CCed. Especially at this fight it is recommended to grab additional CC skills to make up for the lack of CC of your team mates.
Skill usage
Phase 1
Precast skill 4 and 5, , and when she is still invulnerable
Cast to CC
Use
First Add
Use ->
Use
Phase 2
Chapter 4: Scorched Aftermath
(if you party is fast, it will not be off cooldown before )
Weapon swap
if Mama is about to phase (50% HP), keep it for either the add or better for phase 3
Second Add
Use
Phase 3
Cast to CC
while casting
Weapon Swap
Third Add
Use
Use -> ( can be used if the bar is not broken yet)
Phase 4
Chapter 4: Scorched Aftermath for stacking before she reach the party (Ideally right when the third add dies)