Can wilson's disease result in permanent brain damage leading to memory loss?

Not likely. Wilson's disease is caused by the loss of an enzyme that allows copper to accumulate in the body. Most of this is taken up by the liver, causing lots of liver problems. It can also affect the nervous system. However, most of the nervous problems are motor, with some personality changes possible as well. Memory is not typically affected.
And worse. Wilson's brain damage tends to show as movement disorders. If you suspect you have Wilson's, the diagnosis is very easy if your physician thinks of it. Best wishes.
Yes. Wilson's is a defect in copper metabolism. Liver and brain are affected. If treatment is not done, serious permanent damage can occur. Quick and effective treatment can reverse damage and recover function.