Notice that every cell in our body has Iodine receptors which will also attract bromide, fluoride & chlorine. These toxins will displace what little Iodine we have and take over our cells. The ONLY WAY to detox chlorine from every cell in our body is by taking Iodine with required co-supplements. The Dr. Brownstein Iodine Protocol: http://tinyurl.com/Iodine-Handout
Take the Vitamin C to bowel tolerance several times a day to help rid the toxins.
The liver, lungs & pancreas also require iodine, as do every organ in our body.
Your sister has 3 options for starting iodine, tiny doses through painting the heel, small doses with 1 drop of Lugols or high doses as recommended by Trapper at 100mg. All are documented here: http://tinyurl.com/iodine-instructions
I can't say which approach will work best. Starting at 100mg blasts quickly through detox & minimizes detox symptoms for many: http://tinyurl.com/Detox-Help