This is all normal...some babies do well transitioning, some don't. What you all did with slowly getting her use to the idea of milk vs formula is good. Some people like to mix formula and whole milk and slowly increase the milk and decrease the formula and that works. What we did with my daughter, who was on formula, was slowly decrease the temperature of formula so it wasn't as warm, we eventually gave her room temperature formula and she drank it as usual. No problems! This way, when she turned one we slowly gave her cold milk. Increasing the amount of milk to the recommended ounces. But I never gave my kids anything in a bottle except breast milk or formula, milk ALWAYS came in a cup or sippy cup. This way there was no problems getting rid of the bottle. You should also transition her off the bottle and onto sippy cups or straw cups as well. They say no more bottles after a year old. But you see babies all the time with bottles but then some babies are on formula or breastmilk for much longer, which I support breast feeding as long as you can, but that's another subject!
In my opinion I think she is getting to much milk during the day, but if your Pediatrician recommended 24 ounces then ok. I try to limit my kids to 16 oz, but then again, I am bad about that too. I rather they have milk then juice even it's watered down. The lack of nutritional value in juice vs milk says it all. But 20 oz sounds good as long as she is eating a healthy diet of fruits and vegetables as well.
My daughter was GREAT at transitioning to milk, my son not so good. But what we did was just incorporate other dairy products into his diet, cheese, yogurt etc... You should always offer healthy snack options and give milk over juice. What I found myself doing is allowing the kids to have their breakfast with milk to drink, I'll let them have some juice at lunch, but usually water and then milk with their dinner. However, I know my son won't necessarily drink an entire 8 oz of milk at breakfast, so he usually gets milk for lunch too and milk at his afternoon snack time. Table foods are good and should continue to be introduced into her diet, but be careful of chocking hazards and foods that should still be avoided if there are any family allergies or just in general (peanut butter etc...)
In my opinion, once my kids hit 1 year of age, it was game on with all kinds of foods, textures, and levels of spiciness and such. Stuff I don't like my kids do! But this way I know they are getting a semi-round diet of good foods with an occasional sweet treat in there as well. But we also have our bad days and even weeks of eating nothing but noodles, bread, bananas and crackers. But then again we're 2 1/2 so we're always testing life and what is thrown at it!!
Take care and good luck, let me know if there is anything else you have a question about!
A. B