Final answer:
Michelle can access and write the properties of a custom object using dot notation or bracket notation. This allows her to perform operations such as reading, creating, and updating the properties of the object.
Step-by-step explanation:
Michelle can access the properties of the custom object as well as write the properties of the custom object by using the dot notation or the bracket notation. For example, if she has an object person with properties name and age, she can access these properties using person.name and person['age']. Similarly, to write or update these properties, she can use person.name = 'Michelle' or person['age'] = 30.