Update:
We’re still working through the “sexier than a squirrel” course (interrupted by spaying and then a trip back to the UK), so I can’t say yet whether I am in fact sexier than a squirrel, village cat, fox or deer. But it’s nice to see her wagging her tail madly whenever she sees me striding purposefully out into the garden with a pocket full of kibble! We definitely have much more fun together than we would have had without the course.
I tried two long lines, one made of climbing rope that got soggy and tangled all the time, and could have produced burns on both of us, and another made of silicon which was much better, but I found it an enormous faff to be constantly letting it out and reeling it in again. She also immediately started pulling again when back on a normal lead, so I’m not a fan.
In the end, apart from “sexier than a squirrel”, I’ve mainly been working on treating her when she’s walking on a loose (normal) lead/looks up at me.
Today I picked a particularly boring route (cart track, ploughed land, zero distractions) and let her off the lead for the first time! She checked back in with me constantly —it felt like there was an invisible thread between us— and there were no incidents. Her face was an absolute picture the first time she stopped to sniff something and realised I was still walking away from her (you could see the cogs turning), and shortly after that she did a few zoomies with excitement and then just trotted along keeping reasonably close.
It was great to be able to practice recall in a less controlled environment, and a real relief to see that she kept stopping when ahead to check in on me and wait for me to catch up (and give her a treat). Tomorrow I shall be taking really high value treats to really reinforce recall and staying close (so lucky she’s food-motivated).
I’m very glad I waited until it felt right for us, and very grateful to you all for all your advice and encouragement.