hi Little Nemo
having worked in housing in the past for a local authority, i would advise against her making herself homeless. this is a stressful situation and she could get some support in place before this needs to happen. i agree with Lady Sue, i would advise that she gets some proper expert advice about what her options are. if she is renting she may be entitled to housing benefit. she should speak to a Welfare Rights advisor at her local council welfare rights service or at the Citizens Advise Bureau, who would be able to do a benefits check for her and give her advice about what she is and isn't entitled to, including benefits for being out of work.
making yourself homeless can be a tricky one, the council will either deem you to be intentionally or unintentionally homeless. temporary accommodation can often be of a poor standard. if she doesn't feel that she is able to continue with her present tenancy then she could always begin the process of applying for council housing. she may be seen to be in priority need because of her circumstances and get extra points, moving her up the housing list. however, every local authority is different and waiting lists vary in length. i would again suggest that she gets expert advice on this from her local housing office about what her options are. Shelter also offer advice and are be completely impartial - their number is 0808 800 4444.
hope this helps, all the best to your friend.