Yes, Ellen tried to commit a crime against property in this scenario.
In this scenario, Ellen tries to commit a crime against the property; the nature of the crime is burglary. Burglary is a crime against property in which a person enters a building, house, or someone else's property with the intent to commit a crime like theft. Here we can see that Ellen tries to elude the salesperson by telling him that there is another customer, and when his attention is diverted from her, she tries to slide the watch into her backpack, which is a clear attempt at stealing somebody else's property, hence it can be ruled out that Ellen committed a crime, which is unusual in this situation.
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