Once they recovered from surgery, I fed normal. I've had 3 bloat - 2 Danes and a Dobe. One Dane I set to the bridge because she had a multitude of problems (Addison's for one -- she would not have survived the surgery).
The other Dane lived another 5 or so years with no recurrence and she did NOT have her stomach stapled down. Vet said it was more successful in cows than dogs.
The Dobe did not have surgery -- he was just tubed (even though 3 vets swore he was going into or in torsion--I insisted they tube him because he had a multitude of issues and I doubt he would have lived thru surgery). He lived another 6 months with no recurrence and no further bloating.
All 3 were, in my opinion (and I've talked to vets about this) due to high stress situations going on at the time. Vet told me they had a cocker spaniel bloat while boarding.
All of my dogs were fed from shoulder high feeders after the first Dane bloated. The Purdue study, imo, is jaded because they used show dogs -- all high stress.
So, I probably didn't answer your question LOL I'd go with canned or meat until she recovers. Then, if she was mine, I'd feed whatever and make sure I followed the exercise "rules". I also do not feed if I know a high stress situation such as going to the vet, thunder for a thunder phobic dog, etc. they can eat late -- won't hurt them