Dosage for three years old with ADHD?

Hi Curezone Members,
This is my first post. I have been reading through curezone forum some years ago. I'm really addicted to this forum.
I really need your advice for my daughter. She is 3 years and half. She was underweight since she was born until recently she started gaining some weight thanks for the feeding tube. She is showing ADHD symptoms and has a very aggressive behavior toward other kids. At home she is making the life very hard for her little brother who is just the opposite of her.
Ginagirl helped me to get started on the Iodine protocol, Thanks Ginagirl!
I have some questions about dosage,
- I was giving her magnesium citrate 200mg and I started upping the dose, now I'm at 400mg 3 times a day. This is the dose that she doesn't get loose stool at but it seems a lot for me. What do you think?
- Vit B complex: 50 mg twice a day ? Ted from earth clinic said " Vitamin B6's therapeutic range is over 200 mg" for kids with ADHD, So am I giving her the right dose of vit b?
- I'm giving her Lugol 2%, I upped the dose until 6 drops but I had to go back to 4 because I couldn’t handle the side effect (she was very angry). I just ordered the SSKI from trapper. How much should I give her? Should I add Magnescent too?
-Last question for Vit d. I'm thinking about giving her cod liver oil for the vit D vit A and omega 3 fatty acids (EPA and DHA), but I'm concerned about the purity of it. Any idea?

PS. My daughter has a difficulty to talk, she sees speech therapist. She has speech of 2 and half years old.
I really appreciate any help. Thanks!

Leila