Between 8-11 wks, a 3-5 day fear period can occur...during which you should protect her from traumatic events, as they can form phobias to similar circumstances that can last forever. After the period, you will recognize your pup as the same goof before the "fear period" and can resume normal activity. Even without formal puppy classes, just get out, hang out in busy places, let her meet folks interested in doing so...socialize, socialize, socialize!
Remember that until you can get reliable compliance to any command in at least 4 different surroundings, any command is not generalized enough to be reliable. A dog may SIT,COME,DOWN,HEEL fine in your yard, but until you can do them on a busy street corner, in a park, a schoolyard, etc., with distractions present, a SIT at home is completely different than a SIT in the house. You can accompany the commands with hand signals so eventually, only hand signals will be required, and this makes for handy "remote" signals without shouting. (Hand signals are not allowed in SchH, BTW, so if you make a habit of it, it'll cost points during trial, as that's "handler help", not allowed, only voice commands). The key to any training is being consistent.
So no worries, this will pass!
Also, be confident. Expect compliance. Think she will be a good girl. It helps not to worry or dread misbehaviors, as they can read us like a book, and give what you expect.
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