L.S.
First off, you are NOT failing as a mother. Some babies don't start solids until as late as 9 or 10 months (or later) and develop just fine. She's still pretty young and may not be ready for solids if she is refusing them. My son did the same so I just didn't push it with him. I delayed the solids another week and tried again. If he refused again, I tried again the next week. I think he finally decided he was ready around 7 1/2 months.
Also, she may not like what you're feeding her. My son destested rice cereal. It think since he was breast fed, he was used to spicier foods (since we like spicy food) and didn't like the blandness of it. He prefered barley and I ended up making my own baby foods (the book is called Super Baby Foods and it's GREAT).
I had a few friends whose babies didn't really eat baby foods at all. They prefered finger foods and when they were a little older just dove right into the table foods. It just depends on the baby. I wouldn't worry about it too much if she never eats baby food in the first place. Food the first year of life is an experiment for them. They should be getting their nutrition from breast milk or formula and not solids.
It could also be the spoon that's bothering her. The Dr Sear's Baby Book has a good chapter on feeding babies too. His take is that it the baby should be doing the driving and feeding his or herself. Perhaps she would prefer to eat with her hands to start with. You might try that at the next meal and see if she responds. She might just be very independent.
Hang in there and try not to worry about the baby food thing. She's going to be fine. You are not a failing mom because of this. As a matter of fact, you are a very NORMAL mom.