It could be the rose petals. Rose petals is quite appropriate bunny food, and at three months, it’s time to start her on fresh veg anyway. You can stop her access to the roses for now though, since it seems she has a bit of a tummy upset.
A noisy tummy as a rule means gas. There should always be some noise from a bun’s tum, but not so loud as to be audible from a distance. Gas can be painful for rabbits and many bunny-owners (incl me) keep baby gas drops (simethicone) at home, because it often seems to help very well after just 20-30 minutes.
Since your bunny has been eating and drinking and pooping since, she’s probably not in pain. Baby gas drops should be quite sufficient. If she stops eating, it’s a lot more serious.
You can give her 0,5-1 ml gas drops every hour for 3 hours, then 0,5 ml every 2-3 hours. But if her appetite is good, you can just give her the one dose as a precaution.