Hi Mary,
I'm actually jealous that your dog is doing 8 minutes training haha.
When I got my greyhound Johnny he seemed to be so not interested in any training that I thought he will never ever learn anything. It was a bit frustrating because I'm keen to spend time with him and put effort into our training so it felt like a one way thing. It only got 'better' when I lowered my expectations. A lot . After talking to a dog trainer I tried the 'nothing in life is free' method and instead of training 'sessions' I just asked for certain behaviors whenever he gets anything. It seemed to work better for him because he doesn't enjoy training sessions as such and gets fed up with it after a minute. When I realised that I have access to all the resources he wants and needs (food, cuddles, walks, car rides, being allowed on the sofa) I used it to reward him for showing certain behaviours/responding when I ask him to do something.
t took around 6 months till he learned the basics (sit, lay down, come, stay, on your bed, up (go on the sofa or car), off (go off the sofa)). I prioritized 'come' and 'stay' because I find it important for his safety to respond to those words. At the moment he gets no food whatsoever without doing one or two commands. (just like your dog, my dog has a sensitive stomach and i can't feed him treads all day long to keep him motivated). It doesn't seem like a lot of training but it really adds up.
If your dog does 5 minutes training every day, that will make a difference in a few months time. Stop before she gets frustrated and end when she is still enjoying it, makes it more likely for her to do it again the next day. Its great that you want to teach her something and I'm sure if you are patient she will learn.
I know progress seems slow, especially if you are used to train other dogs. I was dog sitting for a Labrador recently and he learned in one afternoon what Johnny learned in 6 months. But that's ok, Johnny did enough in his life for us people, he was a racer for most of his life. he is retired now so good on him for setting some boundaries towards his humans