Formula is a complete food it will give her all the nutrition that she needs. Until seh starts eating a good amount of solid foods she will need formula..
will she eat baby food? you might have to get her used to food with baby food. I had friends that adopted a Chinese baby and it took a couple of months to transition her to table food.. so she ate a lot fo babyfoods.
At her age.. seh can really eat anything.. canned fruit cut up small., (dry them with a paper towel so they ar not too slippery) canned veggies (or fresh just cook them welll done)
she can have cheerioes, goldfish crackers, teddie grahams... try pieces of toast
pasta some rice dishes that stick together are easy for babies to eat..
just try things. you will quickly figure out what she likes..