When she's feeling better, how do I break her very strong association of nursing with sleep? Now, when she's tired, she pulls at my shirt! I still want to nurse her before bed and nap, but it doesn't seem right to wake her if she falls asleep at the breast.
Honestly, I'm not sure you can unless you don't allow it to happen.
I don't think waking her is the answer either, because she still has that initial nursing to sleep association. If you want to continue nursing her before nap and bed, then you'll have to do it early enough to where she doesn't fall asleep on the breast. For nap time, you could do it 30 min prior and then do a diaper change and your winddown. For bedtime, you could nurse before putting on pjs and your winddown.
I just need to ask though, do you really want to break the habit? It's ok if you don't, we're not going to be upset.
It sounds like she's doing fine, really with only that one NW and you felt like you still needed to feed her at that time anyway, right? I'm not trying to play devil's advocate here, if you want to break the habit we can still help, because it will eventually need to be broken. But, if you're happy with how things are, then it's fine to leave it.