Aw op, I'm pleased it came across the way I intended.
In terms of hunger cues, at this age, if your baby is awake they are likely to be hungry. Start preparing the bottle when she starts stirring in her sleep.
The milk is safe for 2hrs at room temp, and one hour once her moth has touched the teat. If she's crying, you've missed the early hunger cued and can lead to more abdominal discomfort, as she will be all tense when she starts feeding and probably have taking excess air in when crying.
Of course this response to early hunger cues is easier in the day when you're awake than when you're asleep at night, so don't be harsh on yourself if you don't wake till she's crying at night.
As she gets a little older and has longer awake periods, her early hunger cues might look like wide eyes, turning her head from side to side, opening her mouth, licking her lips or mouthing her hand.
You mentioned not knowing whether to offer more...if she finishes a bottle then offer more. But be sure she is positioned and fed as per possums video. If she is reclined, the milk will flow into her mouth and that can lead to overfeeding and babies not recognising they're full due to the time it takes for the signal to get to the brain from the stomach.
And while we're talking about it, how are you preparing your milk? If using a perfect prep machine, I would highly recommend preparing as per nhs guidelines: with hot water (at least 70degrees) from a kettle, Water into bottle first then add appropriate number of scoops of powder, for at least a week to see if it helps the reflux issue.
Preparing milk this way and using paced responsive feeding technique resolves a huge number of feeding issues in formula fed babies.
Lastly, try not to worry too much. It's sounds like you're doing a great job and trying to do your best for your beautiful bundle. Remember no one was born knowing this stuff. Becoming a new parent is a huge learning curve and we're all winging it to some extent. 😉We can only do what we know at the time.