Hey Walk, just wanted to say that the above isn't meant to be critical. Every trainer here of every experience level started out where you are now. It can seem like long uphill grind, but if I, who has no patience to spare, can learn to be a fair to middlin' gundog trainer back in my 40s, then anyone can. That you had the courage to ask for advice and post a video of your dog's and your issues shows me you have what it takes.
I'll offer some advice, you can take it or leave as you choose. A couple decades back when I decided I needed a trained lab, I did much as you just did but on a waterfowling forum as I was primarily a waterfowl hunter. The moderator, a pro trainer, took me under his wing, so to speak, and mentored & encouraged me as I raised and trained my first pup from 7 weeks old. Josie (Jacie's Dakota Gold) turned out to the best lab I've trained from pup to Finished, although the current leader of the Wrecking Crew, Harley (Northern Prairie's X Marks The Spot) is a very, very close second.
Along the way, I learned how to be a trainer. As a trainer, it was my responsibility to be patient & clear in my expectations of my dog. I had to bridge the communication gap between us. I learned that rock solid OB is the foundation of all training, and if Josie had an issue with a task, to go back and re-visit the closest corresponding OB. I learned to take as long as needed to teach a task, and not move to the next until Josie clearly understood the current one. I learned not to overburden my dog, training just two 10 minute sessions a day. As Josie matured I gradually increased to two 20 minutes sessions a day at about 12 months. I learned to praise her up when she did well and correct gently when she did not. I learned if I was having a bad day to pass on training as I would translate that frustration, and if Josie was having a bad day, to simplify to a task she had down and end on a positive note, with praise.
I made more than my share of rookie mistakes out of ignorance, but fortunately labs are one of if not the most forgiving and trainable breeds of gundogs. Josie had ample opportunity to quit on me, but she never did.
I can recommend a couple books that I use as the foundation of my program to this day. Those are 10 Minute Retriever by John & Amy Dahl (takes you nicely from 7 weeks up to about 6 months) and Evan Graham's Smartwork and Smartfetch, which will take you from intermediate to finished.
Your young lab is birdy, and that's a good part of the battle. It's up to you to help her achieve her potential. I'm sure the guys here will help you, I know I will, although I'm nowhere as knowledgeable as guys like Irish Whistler.