Is there any way to covince my friends mom to let her go swimming with us?

My buddy planned a swimming thingie at great neck park parkwood thingie.Prob is that her mom says she cant go till august cuz she doesnt know how to swim.i mean honestly you dont need to know how to to swim to go to a pool right.theres the lazy river and shallow end.is there anything she could say strong enough to move her mom to let her go.weve been wait in forever.