It is still such early days. One week post brain injury in ICU will be considered very early days.
like another poster said, ask for daily updates from the nursing staff, and regular updates from the Drs.
At this point she may not even be in a recovery phase yet, so there might not be much they can tell you regarding prognosis, even prognosis over the next few days/weeks, let alone months/years.
Having worked in ICU I think this is the hardest time for families - it is very difficult to accept that sometimes ‘we will just have to wait and see’ is the only truthful answer at this point. Your brain will be fighting to find some point to anchor to - a percentage that you can cling to, or a treatment that offers hope. But at this point sometimes it’s just getting through the day hour by hour.
if she is able to communicate through blinking then that is huge. She is still there and will appreciate every effort you and the staff make to communicate with her.
keep holding/rubbing her hand, you won’t be hurting her.
And one more thing, you may have been putting your own basic needs on hold in this crisis period, but at some point you will need to look after your own health - mental and physical. Or you will fall apart and be no help to anyone.
Eat regularly, shower as often as you usually do, lie down in your bed every night, even if you don’t sleep much. Take all the support you can get. Allow other people to pick up in areas they can, practical help and taking over duties you normally do.
You need to be strong for your daughter, and maybe her kids too, but away from them you’re allowed to cry and wail and break down if you need to, and lean on other people.
Take care, and I wish all the best for you and your family x