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I am sorry that you have been waiting for a response. I recently just logged onto the site and noted that your question hasn't yet been answered. I am a licensed veterinarian with over 25 years’ experience and would be happy to work with you if you are still needing assistance.
I am not sure if you are worried about damage from the injury or damage from the surgery or either. If we were worried about damage and subsequent incontinence from the initial injury, 24 hours would be more appropriate, and the further we get out from that time of the injury, the less likely that will show up. You are correct however that the effect of the surgery (post op inflammation, anesthesia wearing off, etc) and the effect of the pain meds may make it difficult to fully interpret any abnormalities for at least the next couple of days. As you get further out from the time of the surgery, there should be less chance of these things interfering with your interpretation.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
You are welcome and I understand your concern. At this time, really all you can monitor are her elimination habits over the next few days to see if any degree of incontinence develops over the next few days. If none, the odds of it occurring after that are lessened. I hope she has a complete recovery.