[Jon]

You can edit skin1/main/product_details.tpl to modify the adding/modifying product page.

You can modify any field that she doesn't want to see, to become a hidden field (i.e. <input type="hidden" name="whatever" value="defaultVal" />) with a default value when adding a product, or a hidden field with the selected value when updating a product.

Using this method, you don't need to modify any of the php files or have any additional data integrity checks.

Jon