Oh boy -
sorry, but you gave me a good chuckle.
Ok, seriously, the food you are feeding sounds good. You said she 'had' gas before she started eating the new food. Hmmmm - I wonder what it could be?
My boy had horrible gas - very stinky - when he ate 'dog food'. I now home cook and no more stinky gas. They still have some stinky breath, but I don't think I can fix that.
I am curious to see what others say....