Hi K.,
I am having the same issue with one of my 8 month old twins! My daughter will eat virtually anything you put in front of her, my son is so sporadic and sounds a lot like your daughter. I make their baby food from scratch, so I know what they're offered is good for them, I make things I know he's enjoyed before, but it's always hit or miss, usually miss. He does love his bottle, though.
I expressed all of this to my doctor and she reminded me that babies don't actually need solid foods until they're a year old, and that as long as they're consuming around 25-30oz. of formula or breast milk, they're getting everything they need - eating solids at this point is just for practice so when they're around a year old and need supplemental food, they'll know what to do. This relieved me tremendously, and I also decided to move back from 3 meals/day to 2 meals/day (after their morning nap and dinnertime) which also seems to be helping.
I wonder if your daughter is just more interested in bottle/nursing right now and I'm wondering if maybe you're trying to feed her too often? Maybe re-start with just one solid meal a day, then when she's regularly eating that, increase to two, etc.
Lastly, I started to give my babies "snacks" which are homemade baked bread sticks (simply whole wheat bread cut into strips and baked for one hour at 200 degrees - great for teething and cheap!), tiny pieces of cantaloupe, Cheerios, tiny pieces of banana. I give these only if they don't eat their pureed baby food, I figure this is better than fish crackers or puffs and they're also learning hand-to-mouth coordination.
Sorry for such a long response, but I totally understand where you're coming from and how frustrating it can be. Just keep in mind the rule of thumb that as long as she's consuming enough formula/milk, she's healthy and fine and will eventually be eating solids with vigor! Best Wishes!