I say keep her ,use to flush cows ,sell the very best at sales and keep the poorest at that time ,just weighed one up and she was fantastic cow and the ones I sold other people also did well,better than well one ended up raising a Champion or two for EXPRESS when they were just starting ...YOU STILL HAVE THE GENETICS ...
ALSO have a donor right now at a year to 1.5 should have sold her without a doubt,first flush calves on the ground,look great so far,and she is a good looking cow now,maybe she had worms,who know but over the years building a herd some of the smaller cows have made great cows ...