Again, it is my non-expert, personal, crazy-chicken-lady opinion that it is very unlikely Marek's if she showed signs at 2 weeks old, and I think you are doing the right thing in terms of supportive care and supplementation.
Unfortunately I do not think coconut flake will help. If you have any other higher quality nut or plant oil you can try it. Something like food grade almond oil, or if you have a very good olive oil (sadly a lot of the less expensive commercially available olive oils are cut with cheaper oils). Avoid canola, soy, avocado oils (avocado oils may be good for us but avocados are a no-no for birds). I know that these are not necessarily commonly kept though!
Don't go crazy trying to find the coconut oil-- I just wanted to suggest it as something that can sometimes help (I like having it for other reasons, it's the only thing that can help my hair and I cook with it and so on, but you may feel differently and that is totally okay!). I had a completely paralyzed rooster earlier this year and it took me more than a month but he is walking again.
Unfortunately I do not think coconut flake will help. If you have any other higher quality nut or plant oil you can try it. Something like food grade almond oil, or if you have a very good olive oil (sadly a lot of the less expensive commercially available olive oils are cut with cheaper oils). Avoid canola, soy, avocado oils (avocado oils may be good for us but avocados are a no-no for birds). I know that these are not necessarily commonly kept though!
Don't go crazy trying to find the coconut oil-- I just wanted to suggest it as something that can sometimes help (I like having it for other reasons, it's the only thing that can help my hair and I cook with it and so on, but you may feel differently and that is totally okay!). I had a completely paralyzed rooster earlier this year and it took me more than a month but he is walking again.