My baby was very similar, and it was frustrating because all other objects would go straight in her mouth! she has quite recently figured it out - to encourage her I started holding food upto her mouth to try, eating a bit myself then offering it, until she finally started trying to feed herself. No idea if that made a difference or if she would have done it anyway though. The first foods she successfully self fed with were those little flavoured rice cakes and baby wafers, then toast fingers, I think because they are light and easy to hold. She can do fruits and veg now but looking back I don’t think she could manipulate them
They do have to learn to chew, but if you’re giving her chunky purées then I’m sure she chews somewhat? But probably will be a bit of an adjustment when she does eventually have proper solids. But they all learn eventually and at their own pace. I wouldn’t worry too much. Have you spoke to a HV about it they might have some suggestions to help? Does she bring other things to her mouth? Like a toys or bottle etc