Nighttime Routine & Feed

Nights have been varying lately. She didn’t nap well one day so she fell asleep around 6p (which is too early for her bedtime) but we didn’t do her nighttime routine yet (PJs, etc). She gets a bit irritable and puts herself to sleep. I had to wake her and she was not happy.. but otherwise what would I do? Then some days she will nap pretty well, I’ll get her in her PJs and it will be close to feeding but then she’ll be upset (gas, tiredness, something) and put herself to sleep closer to her bedtime. I’ll be rocking her to try to get her calm to latch and before I can even latch she is OUT. I was going to read to her and then feed before bed but she was deep sleeping. She last fed close to 2 hours before so she was definitely due. They say don’t wake a sleeping baby but now I can’t rest really because I know she’ll most likely wake in an hour (or maybe more who knows) to feed. Do I wake her? I never know what’s right. I don’t want her to fight sleep and get overtired but then again I need to keep her nighttime routine consistent. It’s so confusing!