My DD never ate until she was 16 months. A real worry and I tried everything. Now she eats me out of house and home. I am sure saying no just became a habit and she knew it wound me up.
I started just smiling and saying OK, and getting her out of the high chair and then not offering anything (which almost killed me) until the next meal.
DD always HATED her high chair with a passion, hated the height, being above everyone else, the straps, everything. So, I got a small chair and small table and I sit with her on the floor - she loves it. No straps either, too restrictive. Now she stands up but we are getting past that too.
I resorted to making Chicken Balls (minced chicken with Apple and any veggies I could find in patties and cooked) and she could not get enough of them. The were like finger food that were soft enough to eat through teething and but hard enough not to be mush food (which she hates).
I now offer dry cereal as she won't eat soggy cereal, who said it has to be with milk? She eats loads of dry cherios, won't touch anything soggy (apart from at Nursery when APPARENTLY she eats a whole bowl of soggy cornflakes!)
Also a genius thing was a fork. I could 'spear' things and she could take them from the end of the fork or, take the fork and shove it in her mouth. She was so hideously phobic of spoons the fork approach (just like Mummy) really worked.
Apart from that all I can say is no child ever willingly starved themselves and this too shall pass. But believe me I must have posted on MN half a dozen times with worry!
I also let her 'read' those plastic bath books during a meal. Not the best table manners I know but hey, she is 18 months old, I have time to work on that!
Oh, also I used to let her feed her dolly, she thought that was great fun. Now we always have a soft toy of one type of another having some dinner shoved in its 'mouth!'
Good luck, hope it works out.