Found here:

"My daughter went through 2 casts before we found this waterproof
castliner material on the internet. She got the first two wet (broke
wrist at beginning of summer and tried playing around the pool and at
the beach with all sorts of contraptions to try to keep the cast dry
... nothing worked 100%). My ortho suggested this castliner, I bought
it and it was delivered to my home in 2 days ... went to ortho the next
day and she was cast into her 3rd cast with the waterproof material and
we were all so happy. We only wished we had found it sooner! She was swimming
in the pool, bathing, no stink, no itching and when the cast was
removed ... her arm & skin looked great! Here is the link ...

http://www.castliner.com/

P.S. My ortho only recommends it for short arm casts b/c the water can drain out easier.

Great stuff!"

I know it'd mean that you'd have to get another cast done, but it would make the rest of the time easier, and you'll know about it if you unfortunately have another round of broken bones.

I was going to say DEF ask for a waterproof cast. My 2 year old daughter jumped off the couch and fractured her wrist, and we had to deal with a cast that wasn't waterproof for 2 weeks. It was torture. You really can't prevent it from being wet, since she is so young. I put a wal mart sack over my daughters cast when she ate, took a bath, etc. Bottom line, go back to your pediatrician (or call) and ask for a water proof cast. I'm surprised they didn't give you one in the first place. My daughter ended up getting the long cast (that goes past the elbow) because she kept taking her cast off. Only short casts can be waterproof. =(

im a swimmer and someone in our club just has this glove type thing he slips on for swimming, maybe you could find something similar and put it on her during meal times and swim?

Just deal with it. if it gets wet it'll smell then febrezze it. haha jk (sort of).  :) My brother and I had casts A LOT when we were younger due to our bone disease My mom use to tell us stories about how we'd get it wet all the time. It just happens with kids I guess. She gave up on freaking out by cast 3 I think. :) waterproof it! They didn't have waterproof when we were younger. Would have been useful haha.

If you really believe she's doing something because you told her not to, then you need to implement consequences for her actions.  Otherwise, you'll have absolutely no control except violence, and when she's a teenager bigger than you, SHE'LL be the one in control, precisely when you need control the most.

But yes, also get a waterproof cast.

look into the waterproofing thing that everone else suggested.

Decorate it! Stickers, Color Markers, or even the squeezy paints (have a blow dryer handy for that). Let her know it's ok to sit down one time and make that darn cast a sort of celbration! Make it beautiful, paint her nails to match and tell her she has to talk care of her new braclet- not get it wet (Stick a matching sticker on a calendar and count down  til when she get's to take it off) You could also explain it to her as the most beautiful bandaid and she can't ruin it or take it off till her boo boo is all fixed.

you can't put her in time-out? you can't take her toys away? you can't forbid junk food or tv until she stops messing w/her cast?