If your ewe is over 4 yrs of age, you won't be able to tell much more than that about age unless you had correct reg. papers. At 4 yrs they are called smooth mouthed which means the incisors are level & all in wear. Unfortunately highly productive ewes like yours definately have a shorter lifespan. Make sure she indeed does have teeth on lower jaw in front as they wear down with age,depending how much sand they ingest. Supplement with some sort of higher quality feedstuff if she has access to good choice of forages while she is nursing & then when she is dry & open ,she won't require as many calories. I would recommend alfalfa but not sure of protein content of bermuda grass. High producing ewes can starve on grass if it is of lower protein & quality. Too much poor quality forage causes a pendulous abdomen & can cause her to rupture if she hasn't all ready. At her age & level of production,she would be one for the Guiness book of records to have gotten rebred 2 days after parturition. Glad to hear you got her out of that awful situation. Never realized those places were still around.....If you aren't in the breeding business,really wouldn't hurt to leave her open for a year to recooperate & then find an unrelated ram for your herd when the lambs matured.