Hi Kay,
Welcome to the forum. You will find many carers here with great advise and support for you.
I have to say, your daughter is a very lucky girl to have you to support her. I am personally so pleased to see a mum here, taking an interest in her daughters' illness and actively looking to support her. Good on you!
As a sufferer, the onus is on us to start to face our trauma and take the steps to heal from it. Does your daughter have a trauma therapist? This is the most important factor of support in my mind. The forum is helpful, but we also need to work with a therapist to help address our specific issues, and where required, be on medication to help ease our symptoms.
By understanding PTSD, its symptoms and the reactions sufferers have, you can be great help to your daughter. There is a huge amount of information on this site for carers that should be your first point of call. There are also great tips on offer from carers and suffers alike through asking questions in the various threads. Do make use of us, we are all here to help and to learn.
In taking on the role of a carer, you must also look after yourself. It can be an emotional rollercoaster when a family member has PSTD and you will also need support. Which you will definitely find here. Feel free to vent, and discuss any concerns you might have. Your wellbeing is important too!
Much love, xxoo