In "my" experience...Practice makes perfect!
Whether or not you take her back to school practice, practice, practice!!!

Roxey was the only one I kept taking to school (she loved it) and I'm sorry I didn't keep up with the other two. I think it would have made a HUGE difference.

Here we have puppy kindergarten/beginners obedience/advanced obedience and then other classes that are more advanced and do different things like search and agility.

Did your instructor send you home with homework? Our always did. She'd give us a sheet for the whole week.
Three times a day we worked on different things (so she wouldn't get bored of the same thing time after time-she is a husky after all and gets bored easily...lol) I think it made all the difference in the world.

Whatever you decide...PRACTICE

Good Luck