C.V.
Your baby's stomach is about the size of your fist. So, yes, if you're feeding her 5 full containers of baby food, it's likely that you're overfeeding her and stretching out her stomach.
Now, don't panic and be concerned that you're harming your baby. You're not. But consider that the reason she's not feeling full is not due to how much she's eating, but the quality of what she's eating.
You see, jarred babyfood really isn't all that nutritious. It's really just extruded goo meant to teach baby how to eat solids. What she's really needing is the nutrition found in formula or breastmilk.
So, give her some babyfood, and some finger foods like cheerios and cooked carrots and such. To practice with. But once she's had a couple jars, give her a bottle or boob until she's satisfied.
You're doing great. :)