Make note that you didn't see her crush her strawberries. They can be mushed with a kitchen tool or a food processor.
Always return your canner to boiling before you process it for the time in your recipe. Once you remove your jars from the canner, I never place it directly on the counter. You'll want to place it on a dish towel, because the jars are very hot. Allow them to set overnight.
This project is fun for small children. Especially preparing the berries.
Another post on strawberry jam that was done at an earlier date.