I don't follow your logic. If there exists prophesies that can be averted and your actions can affect some prophesies, then surely it'd make sense for Rhaenyra to act in order to try to prevent a "death prophesy". Even if it winds up being the kind of prophesy that will happen no matter what, the outcome is no worse than if she had done nothing (still death).
I think that, being somewhat fuzzy-brained at the time, i missed a step. As a favor, I'd like to ask the chance to rephrase my argument.
There are "evitable" prophecies where you can avert them by being forewarned of potential disaster and taking sensible steps.
There are "running only means you die tired" prophecies where the specific act of trying to avert them doesn't alter the outcome (either to prevent it or to bring it about), but
does end up making your life worse than if you'd just accepted it. Even if the prophecy is "you will be struck by a meteor at the age of X," well, trying to avert it may end up wasting some of the time and resources you
do have on this world to no benefit, if it really is inevitable.
And there are "self-fulfilling" prophecies where it's fairly clear that if you just
hadn't gotten that prophecy you'd almost certainly have never done whatever it was that got you into the situation described by the prophecy, such that theoretically you could avert the prophecy by ignoring it.
...
Now, the biggest difference between #2 and the other two types is whether or not people actually have the free-will ability to avoid the contents of a prophecy at all. Either #1 or #3 means that you
can avert prophecies by taking the correct action, though #3 means that the cosmos is being very passive-aggressive and disagreeable about how it enables you to do so.
It is difficult to say, off the top of my head, whether that ability exists in Westeros/Essos. The whole "Stallion Who Mounts The World" thing suggests that if you know what you're doing (Mirri Maz Duur did), it's possible to avert a prophecy through sabotage or at least force the prophecy to be fulfilled on different terms.
The real challenge is figuring out what kind of universe you live in ahead of time. Personally, I suspect we live in a universe that comes closer to #1 than to #2 or #3, but where a prophecy
can become self-fulfilling per #3 if you fall prey to biases or bad information while trying to avert it.
In our case, the prophecy seems to in some way involve Aelora and us dying over God's Eye in a Dance of the Dragons. We could
almost certainly avoid it, if only by getting killed prematurely somewhere else, not that I favor this solution. I think it may be more like a dream or vision than a prophecy anyway, in the sense that it's not an engraved fact about reality itself but rather a mystically confusing perception of realities that
could kill us.
...
But I think Rhaenyra needs to get some wisdom and lore to help her put all this stuff into context. Alys Rivers might very well be the woman to help us do it.