It was dr social services and are family support worker who told us to make home life as boring as possible
This is not good advice. It is based on the assumption that your DD is simply badly behaved.
When my 12 YO DD1 began to be unable to attend school, we tried everything to get her there. All it achieved was making her feel worse about herself and more distressed. In the end CAMHS told us not to punish her at all and to actively encourage her to do things she enjoyed, e.g. go to the stables to lift her mood and support her self-esteem.
Stopping self care routines was seen as an indicator that her mental health was deteriorating significantly. They were right.
Your DD needs you to know that you are on her side. If there is something making school feel impossible to face, you need to help her work out what that is and find a solution together. Feeling like she is upsetting you or letting you down will not make it easier for her to recover.
Children who don't go to school because it's boring, tend not to be up front about it. They slope off to shopping centres with their mates instead. Those who can't get out of bed, can't face getting ready for school, tell their parents they can't go, etc, usually have some sort of difficulty and are asking for support by refusing to go.
You need to stop looking for ways to get her to do what the adults want and get everybody to work together to find out what is stopping her. Only when you have identified and removed that barrier, will this situation get any better.
I hope you find out what it is soon.