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Hi - Yes, I'd suggest stopping the puppy food and canned milk combination. This alone will probably stop the gas. If it doesn't (and she isn't having diarrhea), you could probably make the gas go away faster with some form of probiotics.
It is best to get a probiotic specifically made for dogs and follow the label instructions. The second best option would be a probiotic for humans. The last option would be 1-2 tbsp. of yogurt (plain or vanilla) added in with her food. I list that last because she might have a lactose intolerance, since the canned milk probably started the whole gas issue. Hope this helps.