Forced property sale

My daughter is in support group ESA and PIP h/h. Due to possible domestic emotional abuse, she has been allocated a housing association property in January 2019. She has had to claim U.C. but so far has been refused because she has a share of the matrimonial home which is mortgages-free. I sought legal advice for her and have been advised that “Because her estranged husband is incapacitated by reason of a degenerative spinal condition affecting his neck, back, arms and legs,”. a Court would not force him to put his home up for sale”. Do you know if the DWP will accep this and allow her to claim Housing Benefit, or can they still force her to take him to Court. He still has their son living with him, although he is 21 so not sure. Thank you.