She would become my wife
In the context of describing a situation that occured several years ago. Like:
At that party (10 years ago) I met a gorgeous girl. She would (later) become my wife.
The problem is of course the tense of become (hacerse or llegar a ser). The wedding occured in the past, but from the perspective of the story it happened in the future.
2 Answers
My try--
En esa fiesta conocí a una hermosa mujer, quien (luego) llegaría a ser mi esposa.
--
EDIT--
I also googled the last part of the phrase and found this--
"En marzo de 1996, fui comprometido a mi novia, quien llegaría a ser mi esposa. Ahora tenemos tres años de casados."
=)
Wait! Remember? The verb became can also be used to mean "To transform into". "The caterpillar became a butterfly."
In spanish we also use the verb "Volver" to say that. But when something transforms into something. "La oruga se volvió una mariposa".
So, you could say "En aquella fiesta (hace 10 años/10 años atrás) conocí una hermosa joven*. Ella (más tarde) se volvería mi esposa."
*Depending on the girl (and her age, in this case) you should change joven for something different like dama/señorita/chica.
But it sounds more natural to say "En aquella fiesta (hace 10 años/10 años atrás) conocí una hermosa joven* que (más tarde) se volvería mi esposa."
Well, thats all. Greetings from Argentina!