12 weeks is also quite young plus sometimes its us that also needs showing how as well (I did 1-2-1s that were invaluable as the trainer could see my technique as well and showed me where I was going wrong). It still also took time with practice every night for 5-10 min or so round the block/along my street. Its also improtant to practise separately from when you're just initially taking her out for a walk or in a rush as you may set her up to fail.
Thanks for the advice Penny, I'll certainly try round the block every evening when we're all relaxed and I'm at puppy class again tomorrow so will ask the trainer to keep an eye on me
Also they haven't still quite bonded with you enough to focus on you at this age (there are so many other competing distractions like the leaf on the pavement
), and by the same token you may not have found the best way to focus her attention either. As her attention span gets greater you will see more improvements in lots of things.