Sounds like you have a good plan worked out with the vet. Always go with your vet and your gut!! If the horse is sore - leave it on stall rest. I hope she has not done any great damage :(
I would work her walks up to 20 mins. JMO to be cautious I would leave her stalled completely for a few days, then do a few 2 minute walks, then 4-5 mins, then 7-8 etc.. until her tissue is a little more worked up to the exercise and if she is at all sore or uncomfortable - put her back immediately. Let her pain be your guide. If she is limping, don't walk her. She will likely walk enough in the stall for the first week or two. Good luck!
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