If you ask 10 doctors for a "schedule" on starting solids, you'd get 20 answers. It sounds to me like the schedule you have her on is a good one and the next step would be to add a lunch feeding, but not necessarily quickly as you've started solids at the very earliest recommended by most pediatricians. I've been a professional nanny for infants/toddlers for 25 years and never had the same experience twice with introducting foods to babies. The best advice, imo, is to start slowly, as close to 6 months of age as possible (some babies do need it sooner but there are many things that 4 month old babies cannot digest properly). If you're going to give her food this young, imo, there needn't be a huge variety as her main nutrition is still coming from her bottle....food at this age is more for training the mouth muscles and getting baby's tongue used to texture. Some people do see the "bulk" of solids impacting the sleep patterns in a positive way as well. But she can get that benefit without taxing her digestive system by giving her primarily rice cereal (oatmeal can constipate at this age) or barley cereal and, for some variety, mixing the cereal with a little apple or sweet potato (those are the first foods most doctors I've seen recommend). Be very cautious not to let the solids interfere with the bottle feedings....i.e. don't let her get so full that she won't take a full bottle as she really NEEDS the bottle nutrients and doesn't need the solids at all except, maybe for the bulk and the muscle development.
Good Luck!
L. Harvey