That's a great night! Makes you feel so much better to get a good chunk of sleep

Swaddling can be really helpful for some babies, makes them feel safe.
Dd1 was a month early and dd2 was three months early. I was always told to adjust their age until age 2.
This is helpful, I didn't know that. If your LO needs her routine adjusted to 3 wks then it's likely to still be quite unpredictable. At that age A times are usually short (only about an hour or so awake) and nap length and wake up timings can really vary. Here are some links that might be useful.
Getting started - how I survived the first 3 monthsAverage A times- BOOKMARK ME! To start I'd just try to get an Eat-Awake/activity-Sleep pattern and keep a note of timings if you want & then post a typical day here or in the EASY board if you want to chat through it more
All the best to you & your LO