If she survived to this age, she must have a fistula from her rectum to vagina.
I would not breed from her, but it she has made it to this age without infection or excessive urine dribbling or scour, she should make it to slaughter weight
This.
The other thing is to be aware that you have the genetics in your flock for blind anus, and check every lamb at birth
. They don't all have the fistula, and prompt action is required for those that don't. Sometimes you can make a hole that will work, generally though we have found that they need to be pts.
And if you can, keep track of the ewes/tups that are producing these lambs, and either cull them, or at least don't keep any of their progeny on for breeders.