Hope she had a better night in the end.
Until the brown kicks in, I would give her as much blue as she needs, with four hour gaps. So, if four puffs is working, then give her four puffs.
Both DS2 and I present with night time coughs. When DS2 was first diagnosed, (after several trips to the doctors over a couple of years, and being told it was a toddler cough), I spent the first few nights where you are now.
When the brown inhaler kicked in, he suddenly started to sleep with no coughs. He lost the dark rings under his eyes, pale skin, and went up an entire clothes size in six weeks.
We have blips (one bad one needing steroids), but we've learned to manage his triggers.
Keep using the blue until the brown kicks in (I was told only to double the brown with advice from the nurse, but generally the first week in September, and at the start of a cold, but only for a few days).
Keep her warm. The cold air is a massive trigger for both DS and me. We have our heating on quite early, and DS has various beanbags and cushions near radiators where he likes to curl up.
Scarf if he's outside,if it's really cold.
Really feel for you. I remember those early days far too well.