R.M.
Hi R.-
I was a Nanny for many years, and healthy eating was always important. Here are a few answers.
First, watch your child's weight, if she's gaining, she's eating enough. If she starts losing weight, it's time to examine things. As for your daughter's "cubbyness" do not worry about fat/thin children until 3-4. Young children need fat for brain development. Your brain FEEDS on fat, that is why you are to use whole milk from 1-2-2.5 and 2% through preschool. Fat for babies is good. When she is older, if her height & weight do not match well, it may be time to cut down on the fat and increase the park time, but nothing drastic.
Next day care. I always recommend parent so suprise visits at different points of the day to see what your child's day looks like. Yes on the first visit, there was fruit for snack and water colors for art, but is that a normal day or a special event? I had a friend who worked for a day care, and even though they had a meal plan monthly, the day care officials bought Happy Meals 5 days a week instead, not good. So stop by, what's for lunch, is she eating, look & observe.
Lastly meals, at 13 months she can have just about all that you have, (NO PEANUT BUTTER!!!). Be careful of typical allergic foods, (ie seafood & nuts). Kids eat in weird patterns. One day their so hungry, it's like the never ate EVER, then the next day they won't touch anything. Kids have a great way of eating only when they are hungry, and stop when they are not, I wish I did.
Focus on healthy foods. The things that are important should be presented first, protein & fruits/veggies. After those are gone, present carbs, (breads, french fries etc). If you give both at once, it's Bye Bye fries, and then I'm full. If you give foods in segments, you can better control what she eats.
I don't have any books to recommend, but when I was a Nanny making meals, I focused on the food pryamid.
I also used this rule, mostly for older kids choosing their own snacks, they could eat 1 of what ever, muffins, cookies etc, but they had to eat 1 of something that grew on a tree or in the ground, (ie fresh veggies & fruits). For the veggies that are tough, carrots, I would boil them in stick shape, rinse in cold water then give as a semi mushy veggie. Kids loved it!
Lastly, drinks. Milk at meals is great then I believe in water through the day. I think it's important to teach kids to drink water at an early age, it helps teach them to drink water as they get older. If kids think that all drinks should be flavored (milk, juice etc), they will never get the taste for water. I used juice as a treat. Juice has a lot of sugar and real fruit is better. It's full of fiber and juice is not.
Good Luck!
R. Magby