Hi C., its normal for babies not to take a liking to solids- it doesnt provide the comfort of nursing, its harder and tastes weird compared to anything they have eaten yet!! Since she seems to be happy and full, theres no need to supplement.. breastmilk is giving her enough nutrition. Plus supplementing will only further discourage her to eat!
A couple of things I would suggest (I have a 9 month old and it worked with her), give her solids when she is not extremely hungry... generally half way between 2 feeds.. Also try feeding her at the same time each day, it will create a routine and soon she will expect it. Don't go nuts on how much she is eating, instead try and see if she eats more over a period of time.
I didn't start my daughter on cereal when introducing solids. Instead I gave her boiled-mashed fruits and vegetables... after 3 months of giving her solids, has she taken a liking for cereal! Another trick that works is try expressing your milk and mixing it in the food you give her. This creates a familiarity in taste, so babies are more likely to take to it.
Finally, I am not sure if you are giving her home made food or baby jar food. It its the later, try changing the brand, she might not like what you are giving her. I have been giving my daughter only home made stuff- she loves it and its quick & fun for me.. not to mention much cheaper... write to me if you would like any quick recipes.
Please don't fret about her eating.. she is growing fine and seems like an adorable little thing! You have nothing to worry about :)
Good luck! :-)