>>281568837
>She already had her strength, speed, damage resistance, poison resistance and healing from the get go.
No she did not. She had above average strength seemingly from birth, but her durability and speed were both average. As an adult, she can outrun cars. As a child, she could not outrun bees.
Garden is likely doing something to them based on dialogue from Yor and McMahon. As for how she was born with her strength, it may have been inherited from her mother who seems like she may have also been a Garden assassin.