Totally normal at that age, it can take awhile for them to become interested in trying to do it themselves. Even then, you'll still be feeding her quite a bit of it while she learns. At this point, you're doing the right thing by having some pieces for her on the tray and eating some yourself so she sees how to do it. Eventually, she'll start picking up pieces on her own or grabbing them from you. I think Tyler was 8 or 9 mo before he started feeding himself...she'll try when she's ready!
Oh, and make sure she can pick up whatever you're feeding her. Sometimes slippery foods can be frustrating or feel yucky, so you can always coat them in dry baby cereal or crushed cheerios. Good luck!
