I agree with the other answers, so to summarize:
Your girl should have milk (breastmilk or formula) as her #1 source of nutrition until 1 year old. So, start a meal with a full bottle and follow with a jar of food (or homemade). 1 serving of cereal plus 2-3 jars of food should cover the food for a day.
If you want to save money by making your own babyfood (I wanted to, but never had the time), you can puree whatever you're cooking for yourself (minus the salt). Feed it to baby when you are eating, or freeze (an ice cube tray was the best suggestion I found) it for future meals. 1 ice cube is approximately 1 oz of food. These can be heated up in the microwave (stir well and don't overheat) for a quick meal. If you do this a lot, you can dump the ice cubes of food into a freezer bag (label & date). I think they can store frozen for up to 3 months.
If you really want to try to get her to be more open to new foods, try introducing finger foods (cheerios, soft fruit, boiled-soft veggies, jello, etc). Maybe if she is able to feed herself, she'll be willing to try new things. Also, don't make a big deal about the new foods, just give them to her when she's sitting in her highchair waiting for lunch, or when she's on the floor playing, set a few cheerios by her. Let her play with them, taste them, and eventually she'll probably find something that she really likes!
Finally, what is your eating arrangement like? Do you sit in front of the tv with a plate in your lap for dinner? Do you go out for fast food and eat in the car? Or do you sit down at the table and eat as a family (even if it's just fast food or something quick--we're not talking 5-course meal)? If you are sitting together at the table, baby should be interested in what you are doing. If she sees you eating something, she might want to try it. Give her a spoon and let her try to feed herself (or just play with it), sometimes just the presence of something new is enough to get them interested.
Good luck!