No I had one one like that. She came to me as a one-crop ewe (having had a single as a shearling gimmer, I was told by the breeder selling her), but she never got tupped at all and never produced anything. Same again next year, so she is gone now. Never saw her near the tup.
Only thing I can think of is that maybe she put too much fat down internally, possibly around her ovaries, and so never cycled? She wasn't visibly fatter than the rest. As she wasn't of commercial value (Shetland) we just had to leave it at that.