Ouch on a number of things... I will simply list them because it might be easier for you to follow them instead of a long explanation.
1) Everybody is right, avocados are complete no-no to parrots, they are toxic to them.
2) A new seed mix is not going to help her at all. You need to reduce protein intake, changing brands accomplishes nothing.
3) She won't ever eat raw produce if you continue to free-feed protein food, especially seeds.
4) The small change in light schedule is completely useless because you are still keeping her up after sunset and not allowing the exposure to twilight.
I hope you don't take this the wrong way because I don't mean it as a criticism to you but I am becoming increasingly worried about your birds... I have tried to explain how their bodies work but I might have given you too much info all at once because, going by your answers, it doesn't seem that you even read what I wrote. I am not offended or upset over this but, unless you learn about their needs and how their bodies work, your birds will not be comfortable or healthy. You really need to do some in-depth research on the right husbandry to keep them healthy and happy. When it comes to parrots, loving them is not enough, you need to learn and apply the knowledge.