DLA for children

This should help you @BekkiG74,

http://www.diabetes.org.uk/Documents/Advocacy/dla/0229A-DLA-children-guidelines-0114.pdf

A Guide for parents and carers.

What level of DLA [Disability Living Allowance] is your daughter getting currently? There are 2 parts of DLA, care and mobility, with different rates of each component. Care can be lower / medium / higher. Mobility can be lowest / highest. If your daughter gets medium or higher care component, and you provide enough hours of care, plus don't earn too much from working, then you would be able to claim Carers' Allowance.
It's complicated, so it's well worth seeking help before completing your form. If you're turned down, then it's worth appealling and again well worth seeking help. Places like CAB, council welfare rights units [depending on your local area], charities that deal wih people with autism and diabetes would all be relevant. The link Diabetes UK website given by Catherinecherub is good. Do remember to write all the issues due to autism when filling in form, as well as the new things caused by diabetes. You'll be asking for a supersession to increase your daughter's current award of DLA. I'm assuming she's under 16 currently? For people aged 16 or over, DLA is being phased out and replaced by PIP {Personal Independence Payment}