Hi ,you need some professional advice,pronto! Book a appointment with citizens advice ,get all your daughter's bills,rent ongoing and outgoings written down,so you can show this! She will get help!
Until you get this appointment ,if there are any pressing bills,ring them on her behalf with her their to give consent,tell them what has happened,and that she is really struggling and you need to help her.
Write down who you phoned,and when and what they said,it helps to recall when your stressed and upset.
Your daughter will need a lot of help to get her back on her feet,can she live with you for a while,so she has support.
With your help younwill be able to get assistance,I did for my daughter,and things will get better.
She is far better without this useless childish non man,he will will get it back ,karma does that,when he is a sad,lonely man ,who women won't touch with a bargepole,he will realise what he has done ,and too late!
Keep pushing for help ,it takes some shoving to get the help,work together,as she will feel very low,and your granddaughter will be unsettled,.
Little kids recover well ,when her mum is happy ,she will be too! Good luck to you!