Final answer:
Ana should check that her computer is not using any VPN or proxy services and confirm that her network settings are correct for a US location, as studio licensing restricts instant watching to the US.
Step-by-step explanation:
If Ana cannot find the US in the Available US list, it could mean that her computer is not recognized as being located within the 50 United States or the District of Columbia. Due to studio licensing reasons, certain content is restricted to watch instantly only on computers in these locations. If Ana believes this is a mistake, she should ensure that any VPN or proxy service is disabled, as these can affect the perceived location of her IP address. Additionally, she should check her computer's network settings to confirm that they are set for a location within the US.