I am a member of that group as well. I have no problem listing my accomplishments. It would be nice to know accomplishments when taking advise from others.I am a member of a facebook group for obedience people where it's a requirement to post the highest level title you've achieved whenever you comment. Sometimes I think we ought to have some version of that here as well. Hopster, this response is from Barb, she has an excellent resume for training her own dogs and also working with clients at the boarding kennel she has owned for many years. She has so much experience working with dogs from loving pet homes and has a wonderful, common sense approach here over many years in dealing with problems like this. She gives excellent advice for your situation, and I encourage you to feel comfortable listening to her.
You've been fair to the puppy and put in time with foundation obedience and since you told us this: "She has been through her Star Puppy and CGC classes and passed fine. She has started the crazy pulling and jumping at times the last month or so. She is fine at times but other times gets completely stubborn and will not listen, not even to a sit command ." We know that you have spent time training and you're currently in class with a trainer who knows you and your dog and has recommended using this tool. You're not someone being impatient with a 3 month old puppy.
Find someone who can show you the correct placement (this matters greatly) on the neck and the way to use it. The 60 pound dog pulling your shoulder out is a safety hazard to you and herself. I encourage you to do a little reading on them, here's an excellent article: Leerburg Dog Training | How to Fit a Prong Collar and if your trainer doesn't have experience with fitting them, get a referral for a private lesson with someone who trains schutzhund in your area and can get you set up properly.
These are mine:
UCDX URO2 Twincreek's Sweet Tiddlywinks Rose CDX BN RN NAJ CCA CGC TKE - Taking a break from agility due to Covid 19
UCD URO3 Twincreek's Black Tie Affair CDX BN RN CCA CGCA CGCU TKI - Training for Utility
UCD El Tango De Roxanne CD RN CGCA - I'm sure there's more for her. I retired her early due to her anxiety.
I have taught obedience classes from Puppy to Competition level Novice.
Two of them never wore a pinch collar. One did wear one for a short time. She has an independent streak a mile wide! Honestly, that's why I chose her!
It looks like Barb has some good advise.