Ok

The other possibility might be that I have a registered black shearling with a tiny moorit katmoget gimmer lamb (whom I haven't registered yet but can) and I was going to sell the ewe anyway, as I want to keep one of my black gimmer lambs - and my flock's too big as it is.
What I don't know is whether or not she'd let your cade 'hang out' with her and her lamb, even if she didn't feed it, or whether she'd bash it, so that might work or it might be a disaster. ..who knows what goes on in the mind of a a Shetland ewe!
Anyway, there it is, if you don't find your little cade - trouble is with Shetlands is that they're good mums, so Shetlands cades are rare.