How to keep a conversation going with someone who doesn’t communicate well?

Anonymous
Maybe “doesn’t communicate well” isn’t the right term lol. But my cousin is usually quite talkative as she’s been on a TV program before and knows how to engage well with others. But for some reason when she’s around family members, she’s the total opposite. She literally gives one word replies and doesn’t ask questions or does anything to further the conversation. It’s so frustrating trying to have a whole conversation with her. She’s coming over and we will be alone for a few hours. How can I keep a conversation going with her without it having to sound as if I’m interrogating her lol?
How to keep a conversation going with someone who doesn’t communicate well?
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