One way she'll drown and another way she'll dry up and shrivel.
She should be okay for about 20-30 minutes from the moment you pull her out of the water and sit her in an empty bucket. I would have a spray bottle close by and lift her out and mist her roots any chance you get, without risking being caught.
Or even better. Put a very small amount of water in the bottom of the bucket.. this will allow the roots to wick some water and it will keep her moist but leave lots of air space in teh bucket that she won't dry up. This way you could get possibly close to an hour.