
Clothes poles are usually pretty sturdy, unless you get a defective one. Surely you have a clothes pole in your own closet that is reasonably over-filled or you know someone who does. Check it out. Is the pole bending? Grab an armful of clothes off the rack and step on the scales. Have someone write down the scale reading. Continue this until you've weighed all the clothes that hang on that one pole. Subtract your weight from each reading and add the remainder together. I suspect you'll be surprised.
Also, I don't know how thick your home-made (very pretty!) pole supports are, but a regular purchased support is 1/2" deep. Even with a little bowing, the poles don't fall out.
Even knowing all the above, I would still put a couple 50 pound sacks on the bunk to test it...Not that your daughter would fall far, with your mattress underneath; but, I don't think you'd relish being awakened in the middle of the night with a broken toe or something of that nature. Remember, you're not just testing the pole but also the fabric and the stitching used to make the bunk's supporting body.