Since she's already had a bottle, albeit reluctantly, she will probably take to it well and do much better. We have a few each year have to come in at a few weeks old as mum's milk fails, and they nearly always get onto the bottle eventually. (Having said which, I am still taking 5 mins three times a day to trickle 200ml into the gob of one waif
- he seems to like the milk but still hasn't quite switched on to how to suck it out of the bottle!)
The only way I could think to get an older lamb onto the other side is to tape up the favoured side - but I wouldn't recommend it. I'd be frightened she's get mastitis on the taped-up side, for one thing.