something else is causing your LOs light sleeping in the night, the dummy is the symptom and not the problem.
Normal dummy use is sucked until in a deep sleep then it drops out - maybe takes 10 minutes of sucking and often less. Once asleep the dummy does (and should) fall out once asleep. It is never meant to stay in their mouth all of the time. The fact that your LO sleeps in this way for daytime naps suggests whatever the problem is happens at night and not during daytime naps.
It is entirely reasonable that a baby that was sleeping through without night feeds will pass that phase and move into a new developmental phase that does need night feeds for a time.
My suggestion would be that the reason for the light sleeping is hunger. I would feed. I find that without exception, when dummy won't do then the baby needs feeding.
Another issue you will have is that somewhere around 5 months babies discover their hands. They like taking the dummy out and inspecting it. Or chewing their hands. Or rubbing their face - all knock the dummy out.
Re-introducing the swaddle for a time helps through this. Otherwise, just accepting its another phase and get through it. Mine were past the hands around face thing within a month.
IMO way, way too early to be removing your babys source of sleep comfort. Also highly unlikely to solve any problem anyway, since the dummy isn't the problem or reason for light sleeping. The dummy is just the symptom of the fact that something is causing your baby to be a light sleeper.
Much of what you write in your most (losing the dummy, not night feeding when baby is clearly unsettled, not swaddling when baby isn't yet rolling) all seem like you are making like much harder for you and baby than it needs to be.
Be kind to yourself and your baby. Feed if your LO is unsettled in the night, you'll get more sleep. Use a swaddle rather than holding down her arms when sleeping - it gives a secure feeling. Let the baby have some form of sleep comfort, so from her dummy.