Don't be too frustrated, she's a puppy still! I'm not saying a puppy that age can't mind well, but they do get distracted easily! Think in terms of motivation. She willingly worked for treats, so go back to treats! Two things you don't want to do is (a) set her up to fail by giving her too many distraction too quickly, and (b) ever issue a command when you can see that she's unlikely to comply or you don't have the ability to enforce the command.
My pup, at about that same age, started blowing off recall. She'd been perfect on and off leash up to that point. But at 5 months she started looking right at me and deciding she wanted to do something else more. I put a stop to that using a drag line. The idea is that you wait until they are playing or otherwise distracted and call her. Once in a normal tone, then again if she doesn't do it right away in a more forceful tone. Give her just a few seconds to comply, if she doesn't you walk over calmly and without a word drag her to where you were when you called her and throw a party, lavishly praising, then release her and do it again in a few minutes.
My dog hated baths, and so didn't want to come near the bathroom where she'd just gotten a bath. But she heard a noise and I said let's go see. She started up, realized we were headed toward that nasty tub LOL, so she turned around. I called her and she didn't come, so I did as I described above right to a spot near the bathroom door. She was visibly relieved when we didn't go in the bathroom. Anyway, 5 minutes later I called her again, and she wouldn't come, same location. Drug her up there again, threw a party, then together we investigated all the bedrooms for the source of the noise. She thought that was great fun, and it worked! She's never blown a recall since...except for rabbits, rabbits continue to challenge her ability to control herself, we're still working on it!
But back on your issue, it sounds to me like you'll likely get back on track by stepping back a little with treats and few distractions. Hope that helps!
It's not the size of the dog in the fight, it's the size of the fight in the dog. Mark Twain
Last edited by tim_s_adams; 10-20-2019 at 11:31 PM.