Whistle or Not?

[Bart Tyson]

College Women's. Last min. of 1st half. Action fast paced. Made basket, I'm new L. I check the clock, I see the clock stop at 5.1 sec. after a made basket, I start counting down, the clock restarts after the throwin. The team gets the ball down court, in front of me, in the corner, for a 3 point shot. The girl gets set to shoot, Beep, I blow my whistle, wave off her attempt, "yell no shot, clock stopped, end of half". And yes she stot and made the 3 point shot. I told my 15 yr. old daughter what happened and she said I should have whistled at 5.1 and reset the inbound play. SSooo, do you think I should have stopped the game with 5.1 and if so what do i do about the time?