She won't produce anything photo-realistic, but if you break it down step by step, she should be able to produce something she is happier with. For instance for a mouse, start by having her draw a circle --tell her that is the body. Then draw a straight line at the back --that is the tail. Then two more circles --those are ears. Then two dots --those are eyes. It won't look much like a mouse, but it will be enough that she can feel good about drawing.
The key at that age is that kids are actually capable of a lot, but they don't have the ability to make the common sense connections between things, so everything needs to be broken down into very small steps. If you search, there are actually a large number of books that teach drawing in this style for very young children (you might also look up the book "Drawing on the Right Side of the Brain").
Also, make sure you praise whatever she produces, even if it doesn't look anything like the example. Remember, you're trying to help her be happy with her own creativity. You're not trying to produce the next Picasso.