Sounds bad i know but I'd be selling her as soon as she is sound. The price of culls just now is enough to take your breath away! Better cashing in and buying in younger fresher stock which will hopefully last much longer with half the work load.
Although I'm the worlds worst for sentimental, I've one ewe that is at least 7 crop, no teeth left and only brings up one lamb a year... but she was my first ewe and i brought her up on the bottle, she'll die at the most inconvient moment and cost me another £13.50 to dispose of cousre, but she's a pet!