Thanks all for your thoughts and views. Anke, Daffy's droppings are normal and there is no evidence that she is pain or being bullied - she bosses the lambs about and trots up to see me when I bring feed every time. I feed her in a hurdle pen so the greedy lambs don't steal her grub. Out of curiousity, I've just had a good rootle around her mouth (rather brave I thought, as she is A Sheep With Attitude and smells like a compost bin!). I couldn't leave my finger and thumb in her mouth for long enough to count the teeth, but she definitely has some molars both sides, top and bottom and is only missing 2 incisors. She really didn't object too much which I'd expect if she had an abscess for instance. Also, she's been dropping cuds since I was given her in July so it's not something new.
Colliewoman, that's a good point about the hay - she's not touching it at the moment - I'll try some mixed with molasses.
I think what I'll do is ask the vet's advice and depending on what she says, get her to have a look and see if her teeth need filing/pulling or if there is possibly some other problem unrelated to her teeth. My tiny flock are non-breeding and with me for life -they are lawnmowers, companions for the ponies and give me fleece and a lot of fun and interest. Daffodil lambed last April and I also have her (wether) lamb, and she won't be breeding again.
If vet or I think she's in pain or deteriorating further, I won't prolong things. Will let you know how it goes. Thanks all.