Sick day rules...
The DDA and the disabilty Act ensure that within in reason a company must accommodate the needs of a indivudaul disabilty...
For your firend this would be being allowed to work or breaks/meals times around her diabetic control... ensuring that she has access to her meter/insulin and what ever she uses to treat a hypo and with out restriction... That she is allowed to attend clinics and appointments as necessary... also that there which is concidered (by her mainly and in relations to health and saftey) a safe and clean envirnoment that she can inject if necessary...
The DDA, is a organisation that provides the relevant information concerning work/employment problems, they can advise you of all your options, can act as immediators and also help with any legal cases that might araise... Always worth a phone call if you think that a problem might araise...
It sounds as though your friend is pretty new to being a diabetic, (assumption, of not being able to inject) Which sounds as this can be having a impact of her ability to control her own diabetes her self... If her diabetes is uncontrolled then this would suggest that the time off sick is based around this lack of control ability...
I've worked for a company that worked this system, and in many ways it's the pits... If they are saying that her scoreing is bad and must improve and are hinting at sacking.... Well to sack her because of her diabetes would be difficult, more so if she is pretty new to diabetes and she can ask for assement via occupational health, and if she belongs to a union then she can ask for there involvment... I spent 3 1/2 years fighting against them trying to end my contract!
If your friend can be encouraged to seek the help that she needs so that she can take over all her diabetic control, she should find that her life will become a lot better, not just getting her indpendance back, which I'm sure she must despartly miss, but this should go a long way to enable her to achieve good control and a out come of less days off sick due to her diabetes...