You cannot activate this card during the Damage Step.[1]
The player chooses how many Level 4 or lower "Amazoness" monsters to Special Summon after destroying all "Amazoness" monsters.[1]
Destroying all "Amazoness" monsters and Special Summoning the "Amazoness" monsters do not occur simultaneously. The effect finishes resolving with you Special Summoning "Amazoness" monsters. If you do not Special Summon any monsters, then the effect finishes resolving with you destroying all "Amazoness" cards.[2]