Since she is not allergic to milk now I recommend weaning her off formula unless this is something your pediatrician has told you she needs. Formula is a complete meal. Formula is everything a baby needs to live, it is the food they eat. So, if you are giving her formula she is eating, well, drinking her nutrition. She has no need of other food. Formula is complete. If she is still taking a bottle then just use it to give her fluids for now, too many changes at the same time is hard for anyone. You can strt giving her tippy cups with her favorite drinks in them to get her used to them. J needed to suck so he stayed on the bottle until he was 2 1/2. He just put it down one day and didn't pick it up again.
If you decide to wean her off the formula I recommend this way.
If you cut the formula and start the baby on regular milk cold turkey then you are going to have some bad, stinky, diapers. One of the kids in my child care center went cold turkey and her pooh was so bad I puked every time I had to change her. I changed diapers a dozen times a day and only hers was that bad. Also their little systems take time to adjust.
Since you have been trying to give her regular foods she may not have such a bad time but her tast buds have to get used to the new flavor of milk.
Start using 3/4 formula and 1/4 milk, see how this goes, if she does okay then a few days later go half formula and half milk, then a few days later 3/4 milk and 1/4 formula. At this time she is usually going to be able to switch to total milk quickly.
As for baby food in a jar, have you tasted it? It's gross. If she needs her food less chunky the use a blender and chop up the food you serve everyone else. I bought a Pampered Chef Food Chopper and chopped the heck out of our dinner food and fed it to the kids until they could chew it up themselves without gagging on the chunks.
Toddlers have tiny little stomachs and need to eat little bits every few hours. They do graze...have lots of nutritious tidbits around all the time. Like fruit gummies, bananas, you can cut up half a banana into 1/4" bits and save the rest for later that day, or eat it yourself...goldfish crackers are bite size, anything you can cut up into 1/4" pieces, apples can be cut up the coated in 7-UP or Sprite to keep them from turning brown, pears, peaches, mandarin oranges, mixed fruit can be purchased in individual size cups at Wal-Mart. Tyson frozed nuggets and chicken fries can be heated up in seconds and are white meat.
My favorite cook books are:
Idiots Guide to Feeding Your Toddler and Baby
Baby and Toddler Meals for Babies
Both should be at your local library, check them out and see if they have information you can use. If so they can be found at most book stores like Hastings or you can always find them on Amazon or ebay.com.
PS: If she is scratching after eating mac and cheese she may be allercic to something else in it. If the allergist said she not allergic to milk then she isn't, did he do a skin test? I was allercig to 74 out of 80 things I got tested for. I had huge swollen spots on my back and then even more onmy arms. Talk to the allergist about possible wheat allergies or even something else.
Is it possible she may be constipated? People don't eat when that happens because they are full....