I'd keep going to the vet, or at least I'd be calling them regularly if she doesn't get better. I am NO authority and have never had a dog with ACL, but it looks like a bad limp to me. Tani had a limp for about a week. I (ok, hubby) wanted to give it time to resolve. When it didn't, I took her in. Luckily, it was just some kind of strain, and anti-inflammitory meds helped her get past it. If you've been through all that with Grace already, I'd start saving $ for the ACL surgery if that is what is being recommended. BTW, too cute that she shook her head like "No" when you asked her if she was getting better!!!