Wounded in a strange land and burden by carrying a body along???
But this revenant looks like a fun and fitting RP option. So if you applied it to Irena she would lose a skill and her feat. And gain +1 CON and Relentless Nature.
And probably have to dig herself out of her own grave!? Sounds fitting I think we could add it into this and she would rejoin the group after she rises from the dead. Please adjust your character in the RG to reflect the subrace, and level up to 3rd also.