Hey ClaraC. I did a long post in your other thread. Tully had a really high herding instinct and was a very difficult puppy. Or maybe it was because I had all laid back boys before so in comparison she was difficult. Anyway, in hind-sight I wonder if it was me that learnt how to manage her rather than her changing. I will forever regret getting this one particular trainer in, who followed alpha methods, who owned Rotties, and was a bit sexist ("women talk to their dogs too much"), because his techniques did make things worse. Luckily, after she was attacked I found a veterinary behaviourist who was experienced with herding breeds and was able to read Tully much better.
Nowadays she is actually the most beautiful natured, well-mannered little dog, she still barks at cars in the back of the car (when I can't focus on her) and will think about chasing roos, but that's not so bad. Don't lament too much, because you will probably find once Eevie is out of adolescence she is a lovely girl (or you've worked out how to manage it). For me, well I went and became a dog trainer myself, and was running a dog club, so I have to thank Tully for her influence in my life.
I will say, I did a lot of obedience training and agility with Tully, but it was really doing flyball that hooked her, and got her over the extreme anxiety she developed after 3 dog attacks. The focus and confidence it gave her was amazing.
The previous posters are right - you need to do some training to give you the tools to manage her, and your job is to build her confidence. If you can't do a dog sport then teach her fetch to get some energy run off her (exercise reduces anxiety and increases confidence) and if you don't have a park nearby you can play fetch at home before you head out so she's run off some of the excess energy. Also, both my dogs can be stupid before heading on a walk, even at 11yrs old (they egg each other on). So I ensure they're calm before we head out. We do some obedience commands or tricks to get their focus, and if they're silly, it's back to the car or home until they calm down.
Btw - veterinary behaviorists worth checking out are Dr Ian Dunbar (Dogstar Daily) and Dr Patricia McConnell, also Dr Sophia Yin, Dr Karen Overall, Karen Pryor (they are all on the internet). And a book I found useful was
Help for your Shy Dog by Deborah Wood
https://www.amazon.com/Help-Your-Shy-Dog-Terrified/dp/0876050364. Also, if she's not picking up things using usual techniques the newer
Do as I do technique is an amazing alternative.