What can she do i think she needs help?

my friends partner was abused as a child and has completly surpressed the trauma my friend got with this girl after leaving her male partner anyway her partner keeps blacking out as if shes a completly different person her eyes change colour and she becomes aggresive to the point that she hs raped my friend, then when she comes round she know nothing of her actions and when she is told what she has done is completly devastated my friend has asked my advice it does sound to me as if this may be a post traumatic stress situation perhaps brought on by yers of suppression can anyone offer advice it would be gladly appreciated