sudden agression

My 8 year old grandchild is typically polite. She is on gfcf diet since age 4. Two weeks ego suddenly she became aggressive, calling names. Please help. Any advise are welcome.

Hello,
Yes, when you change a persons diet, especially over to a healthy diet, the body is more able to remove toxins. It is usually this detoxification process that can create stress on the body. With children who are compromised already, this extra stress can create discomfort, such as headaches, that they react to violently.
Try using a little Glutathione daily to help the liver remove the toxins. Drinking plenty of water is also important and getting more rest as well. Mostly, keep up with the healthy diet, remove sugar and more veges and fruit.
Good Luck!