S.W.
Any child that has been sleeping and suddenly starts waking as you describe has hit another growth spurt. Most kids take a bottle or nurse at night. So figure out when she is waking up and have a bottle ready to feed her and change her while you are at it.
In a few weeks she will go back to sleep as the spurt will be over and the next one should be about 9 to 10 months.
There is no manual with a kid it is all on the job training and each one is different. Good luck to you she will be fine.
The other S.