Has she always only taken 4-6 oz in her bottles? Just curious b/c I know DD took about 8 and then dropped her intake until we dropped to 3 bottles a day rather than 4. You said she doesn't grasp food well, will she refuse food if offered on a spoon by you? DD went through that phase, and we went to a lot of finger foods, but she lets me feed her again now at 12 months. You can offer a ton of finger foods....any of the veggies you offer in jar form, can be offered soft/cooked in small pieces that she can feed herself. Cheerios, pieces of bread, pancakes, other pastas with tomato based sauces (if you don't put a lot on they are less slippery and easier to grab--same goes with mac n' cheese, if you make homemade with flour and cheese etc you can make it a bit drier and it's easier to grab), you can use any soft fruits or cook the harder fruits like apples/pears and offer them in small pieces as well. Anything that comes in a jar can usually be prepared in a finger food way. Around this age, DD started eating a lot of what DH and I were eating, excluding allergy prone foods and choking hazard foods.
The biggest things are....are you and your lo comfortable with introducing these foods? How is her weight gain? If her weight is fine I wouldn't worry much. Food is still not a main source of nutrients until 1 year. BUT if you don't introduce more finger foods your lo may not take to them at age 1 and then you may end up concerned about food intake etc. You might want to check out the threads/FAQ pages about baby led weaning for ideas so that this transition goes smoothly for you.
HTH.