Help!

Our pup is 5 months old, loving, friendly & a goof ball. However she is just horrendous at times(I know some of it is typical puppy behaviour), she doesn’t leave my other 2 girls alone & my mini dachshund is afraid of her as she just pounces & then latches on, I’m sure this is play however it’s very very rough play, we’ve had instances of snapping at us when she doesn’t want to be moved or come in from the garden. We are enrolled in puppy classes & she does well with these. The barking & howling is also pretty bad & I’m sure very shortly I will get a noise complaint, I’m trying but failing to teach the quiet command.

I’m questioning whether I’ve bitten off way more than I can chew with our girl & the changes that she’s bought to our home have been tremendous, I just feel totally overwhelmed.