Such is the fate of a prequel character. Death or irrelevance.

That being said, I would like to note that her solo, +Florina, +Kent endings have her simple return to the plains where she used to live.
So, you could say she avoided the bullets in her others endings and simple "waited out the storm" when FE6 happened.

Here's hoping when the time comes for a FE6&7 remake, she is given a confirmed "happily ever after".

From the plains to the valley.