What is the meaning of "drown someone out"?
"To drown something/someone out" means to use one loud noise to cancel out or overpower another loud noise. In this context, she is saying that she will "send a flood" to cancel out or overpower the criticism and hurtful words of other people. Ex: The train drowned out the sound of his voice. Ex: I turned up the sound of the TV to drown out the sound of the lawnmower.