Any Good Brain Game / Mental Stimulation Exercises To Do With An Australian Shepherd?

Hello there, I have a 2-year-old Aussie going on 3, and for the last 6 months I have not really kept up with her mental stimulation portion of her training. Not because I don't have time or don't want to, but simply because I have completely run out of ideas.

I work from my home office so I have a pretty good amount of time everyday to work with her, and I have taught her every trick in the book already from the easy ones: roll over, play dead, crawl, spin, sit pretty, etc... to more advanced stuff like getting a beer from the fridge (which she was doing by 9 months old), cleaning up her toys and putting them in a bin, helping bring in grocery bags, closing doors, etc..

I'm honesty completely out of ideas, and when I do find something to try out, she masters it in like 2 or 3 training sessions (1 training session for the "normal" tricks/activities), these dogs are just too damn smart for their own good. We have already tried things like naming her toys, which she can successfully do for every one that she has, and I've also tried giving her puzzle toys (either bought or created like the muffin tin one) which as soon as she figures out once it is no longer a mental exercise for her.

Any ideas on some activities I can do with her? I feel bad she hasn't been getting the amount of mental exercise she is use too, I want something difficult that can be changed up often so I'm not back to searching again after a week. Any tips/ideas welcome. Thank you!

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