I read this in an anthology in the early-mid 1990s. Details are hazy, but the main character was a clone fighting in a conflict. She doesn't seem to realise that she is a clone, and believes herself to be the original and is still essentially living out the memories of the person she was cloned from.
She's eventually captured, but at the end of the story is rescued by another more advanced clone of the same individual but who looks almost angelic, surrounded by a swarm of tiny versions of herself.
I thought it might be an Orson Scott Card short story, but I haven't been able to find anything that sounds similar in his bibliography.