Help my pup has become a yo-yo on walks

My pup is 1 yo and a ACD/border collie mix with some other fun breeds.

Shes 60 lbs, strong as hell and still pulling on our walks.

We’ve been using 5 main methods:

1. Stopping immediately when she pulls

2. Using the 1-2-3 game to get her focused on me

3. Kong hand (constantly distributing treats to lure)

4. Always rewarding when she looks at me

5. Avoiding situations that will get her over threshold

These are things we learned in puppy class ( I’m also a big fan of happy hound training on YouTube as it feels like a refresher of the classes).

My girl however is becoming a yo-yo on our walks and I think I’m reinforcing it.

See we’ll do the 1-2-3 game and the moment she gets the treat at 3 she’s already on her way to the end of the leash. I’ll stop when she starts pulling, she’ll come back to receive the treat and then instantly take off again. So I think I’m just reinforcing her to come back and take off. I can’t get her interested in receiving another treat for some reason. Sometimes she’ll reject the treat when she comes back and then take off.

Any suggestions or video recommendations to help with this?