Final answer:
In this situation, it is best to contact the customer and inform her that you have found the item she was looking for.
Step-by-step explanation:
In this situation, the best course of action would be to contact the customer and inform her that you have found the item she was looking for. By reaching out to the customer, you are showing excellent customer service and keeping her notified about the item she requested. Assuming that the customer has already purchased the item from somewhere else or offering it to another customer without confirming the customer's interest may lead to missed sales opportunities and a negative customer experience.