I found our daughter started to really eat what seemed like real meals and in more significant quantity around 10 months, and it's increased from there, but we started BLW at 6 months so she has only ever fed herself, so I think that makes a difference. For many kids, it's perfectly normal for it to be over a year, particularly if you have to make the transition from spoonfeeding to normal eating, as it's basically like learning everything all over again. I would say just give it time and like you said, keep mealtimes relaxing and stress-free. I wouldn't worry too much able throwing food and things at that age. Every child is different and you know better than anyone, but she probably doesn't have a grasp yet of 'right' and 'wrong'. My daughter is 26 months and she's really only starting to understand the concept of behaving properly at meals. Not to say she was horrible before, but they do drop and throw food off the table, they do throw forks and spoons, and sometimes plates. But they also throw toys and balls, etc. and it takes time for them to understand you don't do that with food. It's not obvious that it would be any different to them at first.
You'll have a sense of when it's obviously intentional and something to intervene on, and when it's just playing and they don't get it. I would definitely pick it up and try to reinforce that food stays on the table by saying something like, 'let's eat nicely and keep our food on our plate', but I wouldn't get upset and shout no because it will probably just change the atmosphere of the meal and not actually have much effect in terms of stopping the behaviour. There will be time later when she has more understanding of what's good behaviour and what's not so good that you can really drive that home, but for now, I wouldn't think it would do much good to focus on it too much. But you can cook with her (sit her at the table with you while you chop vegetables and show her things as they are cooking) and eat with her, and that will model good behaviour and get her interested in food, and I think it will come with time.