How much should a 7 month old eat a day?

My daughter loves jarred baby food. On a typical day, she will eat 2 4oz jars of meats (chicken, or turkey) 1 4oz jar of veggies and 1 4oz jar of fruit. However, some days she will only drink 24oz of formula. I try and give her 4 8oz bottles but this rarely happens. Is she eating enough? She was 18lbs at her 6 month check up and in the 90% for both height and weight so she sure doesnt look malnourished but Im just concerned if shes drinking enough formula.