Did she forget all her training?!

I adopted a dachshund/corgi mix from the shelter last year. She’s approximately 1.5 years old and I’m pretty sure she’s forgotten all her training. It’s like these last two months someone men in black mind wiped everything she’s been taught. We went through 8 weeks of professional training and I still do all the things that we were taught. Is she just being rebellious? Is this like a teenage dog thing? What should I do to help reinforce the training? Thanks for any suggestions!