I feel she could learn much more, but I'm at a loss right now of what else to teach her. Is there a learning window of opportunity. Like an age they hit where it's much harder to learn new tricks?
Oh, she has YEARS to go before she'll start slowing down on what she can learn... like 10 or more year, anyway!
There are lots of books on trick training, or you can also find a lot on YouTube. Many training centers also have trick training classes.
Don't forget to train the basics too. They are the MOST important in terms of just living with your dog as a family member, and in terms of safety. You want to make sure she has a good, reliable recall, a solid stay, and a "go to place" (people call this a lot of different things, but its a specific place she will go to, and stay, on command to keep her out from under foot when you are cooking, carrying heavy objects, etc.
Once she has a good recall and a quick, reliable "down", you can start working on what Kodi is working on right now (among many other things!!!) which is a "drop on recall" For this, once you call, and the dog starts toward you, at any point you shown be able to give a down signal, and have the dog drop in his tracks. This is another GREAT safety tool. Fo instance, say your dog crosses a street without you. You call her back, and like a good dog, she immediately turns to respond. But at that instant, you see a car turning the corner. If you can drop her in her tracks, you can keep her from getting hit by the car! (hopefully, not a situation you will ever be in, but better safe than sorry!!!)