thanks everyone and loved the diagram, thanks so much for taking the time and trouble to draw it at all!
we have tried the pen on the other side of the gate approach, but that is what i meant about her and her mother being too wiley to fall for that - she just wont come near it if there ar humans about, if you try and herd her in, she scoots out the way and if you arent anywhere near it she goes in fine, but as soon as you approach to shut the gate (and her in the pen), the rest of them stay apart from her and her mother!
it is driving me mental and they are clearly not hungry enough to care about a bucket of feed and i cant really wait till they are as i need to get the rest of the ewes onto more grass for the tup coming the weekend after next...so time is running out.
thanks for offer of shepherding, cash a bit tight at the moment so will need to try other means i think.