We had the surgery done our our oldest when she was 2 yrs old, she's now 8 and doing fine. Yes, we remember we couldn't keep her down either, even with her pretty pink cast on. If they're not in pain they will want to move around, don't worry, she'll go at her own pace and be fine. Best of luck with her healing process.
Her biological sister, 2 yrs younger didn't have any signs of this problem and is fine.