Have you tried one of the things that look like a dummy with holes in so she can hold it and suck the puree out? I think they advertise it for teething and stuff, I'm putting lumpy food in and fruit at the moment and my little boy loves it as he feeds himself. Just a thought. Hope it gets easier for you x
Both my children have been like this - very independent! I've found that by loading it for them & just letting them have a go they soon get the hang of it. My first was confidently and fairly efficiently spoon feeding himself by 9 months. My currently 6 month old drops a lot but definitely gets a fair bit in too! I've found the below chunky spoons are easiest for them to use at this age. And a suction bottom bowl!! https://amzn.eu/d/4M0Zrhp
We're in exactly the same boat! I have no advice. I'm just going down the finger food route and trying a puree every few days just in case. My health visitor was pleased she was accepting finger food only. It's OK but it's harder work cooking proper food for her all the time