First, I must ask: are two different people using the same account? The first post contains a very well written letter, with clear thoughts, correct spelling and grammar. The next post from this person (not the breeder's reply) contains very disjointed thoughts with poor spelling and grammar. If husband and wife are both posting, I would suggest you each start your own account so that we can keep track of who we are speaking with.
Second, your breeder's advice is archaic at best and cruel at worst. An e-collar on a 14wk old puppy?? NO ONE worth their salt would ever suggest that.
It does sound like you are doing things correctly in many aspects. NILIF is a great program, keep at it. However, you can stop pretending to eat from your dog's food, this does nothing for your dog.
Also, do not pick the dog up, she has 4 feet that work perfectly well. If you need her to go somewhere, snap a leash on her and head off in that direction smartly. She will not allow herself to be drug.
Alpha rolls are a VERY archaic and BAD idea. NO mother dog EVER does this to their puppy. The only animal which rolls another animal is predator rolling prey. By rolling your puppy, you're scaring the heck out of her and making her fight for her life. Not a great way to build a trusting relationship.
I would work on increasing her exercise more. Find somehwere that she can go to run off-leash (a fenced baseball diamond, a non-busy woods hike).
For the biting, I would take her collar firmly in hand and CALMLY tell her "no!" Sit and hold the collar (with a stiff arm out away from you so she can't bite at you), until she stops being a fool. This can take minutes, but do not give in. If you raise your voice, she reads it as a game. You need to speak in a clear voice (not an excited one, and most people's voices, when mad, are "excited.") and with a low tone.
You have only been to one puppy class, so the statement that you've tried a class and things are all better is rather pointless. You need to give things time.
It sounds like you have a typical rambunctious puppy on your hands. She's shown you her intelligence, work with her in that aspect, rather than trying to bully her physically. The crate time-outs are a good idea and if she gets back into stuff after the first one, she can have another one.