It is a growth-spurt.
6 months old, and every 3 months... is a growth-spurt in a baby.
At each growth-spurt... they get hungry, and more frequently and their intake needs increases... to keep pace WITH their growing.
Both my kids, I breastfed... and they had GINORMOUS appetites. I nursed on-demand 24/7, and per our Pediatrician.
For the 1st year of life, a baby's PRIMARY source of nutrition is from breast or Formula... NOT solids and NOT other liquids.
Both my kids, at that age... woke more than yours.
And... babies often go through "cluster-feeding"... which means they need to feed even every.single.hour. It reflects their changing growth and intake increases. And so that... your milk composition and quantity... increases as well and to provide what the baby needs.
I just nursed my kids on-demand... especially for the 1st year. And I always knew when they were having growth-spurts. They had huge appetites and grew like weeds.
You can tell if it is comfort nursing or nursing.... by if she is actually swallowing... or not???
As a baby gets older, their suckling/nursing gets more efficient... so they then do nurse... quicker and more efficiently. Not for a long time like when they are newborns. So that is also a difference...
Your baby IS also sleeping-through-the night... because she is going from about 7-8:00 until 1:00am sleeping. For a baby, sleeping through the night, means sleeping for at least 5 hours straight. Your baby, is doing that.
all the best,
Susan