Why do INFPs ignore friends for days/weeks?

My friend is an INFP and she can sometimes ignore a simple message for up to 2 weeks despite talking to other friends regularly in that time. When I confronted her she said its not because she doesn't like me its just she doesn't feel like talking. She always reads the messages but doesn't reply.

it just makes me doubt my value to her as a friend and I feel shut out. Especially when I see her posting photos with friends

Why do INFPs ignore friends for days/weeks?
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