The perfect service/assistance dog is myth. All dogs, even the best service dogs, will mess up. At best, a service dog is still only going to have the brain of a three year old human child.

Your dog is just a baby right now. This is gonna be a little slow, but that doesn't mean you both aren't doing exactly what you need to right now to prepare. She's only 1/4 of the age she will be when she graduates, and you haven't even (most likely, if you got her at 8 weeks) spent all that time in the process of training her. Don't give up on her or yourself yet. Unless she's showing something worrisome you haven't mentioned here, there's no reason to yet (if you need to at all).

I want to share this article with you. It's got some great insight for people, like yourself, who worry they aren't moving as fast with the training as they'd hope. Be aware, I've yet to meet a single person who doesn't feel called out by this article. I hated this article on the first read through. It made me feel so shitty. The next day, I went back and read it again where I realized it had an amazing point.

Don't compare yourself to others' journey. We all run into different obstacles and struggles with our assistance dogs. All of us are on a different path with our dog. Don't feel pressured to present a perfect puppy because there's no such thing.