9 month old lack of interest in food

My daughter is nearly 9 months old and the worst eater. There are only a handful of things I know for certain that she will eat: Weetbix, toast with peanut butter or avocado, milk arrowroot biscuits, pancakes, yoghurt and some pouches but only the fruit ones. Sometimes I can get her to have other things like cheese or a strawberry but not very often. Every night I will give her what we are eating but she just plays around with it or throws it on the floor, doesn't even attempt to eat it. When I try and feed her she clamps her mouth shut, when I give her the food to feed herself she plays with it. It's just starting to get very frustrating and stressful for me as I keep getting told that by 9 months there should be more emphasis on food rather than formula but that's just not going to happen. I just don't really know what else to try and Dr's and MCHN haven't been overly helpful. She's my 2nd child but my son was never like this, he started eating solids from 5.5 months old and would eat anything and everything. The other issue is that she doesn't drink an awful lot of formula, this all started when she was sick with a UTI and then on the back of that had bronchiolitis, she is not dehydrated though as she has plenty of wet nappies, I just worry that she is not getting enough nutrients. I'm just stuck as to what to do, do I just keep going in the hope that she will just one day start eating or do I take her somewhere other than the GP (paed, dietician??? I don't really know). Thanks for reading and sorry if it doesn't make much sense :-D