Share 'Coat in very bad condition'

I’ve adopted an Red Setter (Maggie) and she arrived in a very poor condition. She hardly has any fur in her back, and the reaming coat is dry. I’ve been giving her some fatty acids, I scrub her coat with a good body cream and brush her every day with a soft brush. I’ve been doing this for the past 1.5 months but I cannot see big improvements. Can anyone give any tips to help her?