You might need to show her how it's done. I got one for Christmas and it's pretty cool. I wanted to try it on some cheap meat so I bought a Top Round Roast at Sam's for $13 and gave it a try. I planned on cooking it while I was at work, but I checked it in the fridge the night before and it was still frozen, so I just went ahead and started it at 10 PM. I added salt, pepper, garlic powder and onion powder and cooked at 135 until 6 the next night (18 hours). Then I seared it in a cast iron pan. It was amazing. We made french dip sandwiches and they were the best I've ever had. I used the bag juices with some beef broth for the au jus. I was not expecting it to be that good. I was shocked. I could have eaten the whole thing right there, but I saved some for day 2.
I don't know much about cooking and I don't know if this picture even looks good or not, but here it is. I DO know that it tasted great. Tender and juicy and very forkable.