I feed raw and get it from
Food4-Cats!, Just Food for Cats Nothing More! - it is ready minced, has all the vitamins that are required in it, the right proportions of bone, muscle meat and organ meat etc. If you feed it yourself - then you need to make sure the proprtions are right 80% muscle meat (including heart), 10% oragn meat and 10% bone - that way the vital taurine levels are correct.
I would seriously consider taking your cat off the dry - raw and dry aren't the best mixture. Certainly I wouldn't feed the two in the same day. Maybe raw one day and then dry the next. The digestion rates of the two are going to be very different and could irritate her IBS. In respect of her IBS I know of anecdotal evidence where a wholey raw diet has cleared up cats' IBS (probably as cats haven't evolved to eat grain and most cat food has grain in it - this can't be digested by the cats' gut and it is passed through - so most cats poop out a lot of their food as they can't actually digest it!). Dry is also very dehydrating and your cat needs to drink an awful lot of water to counteract this.
Hope this helps