Why after I send a friend request to my sister does it no longer show an add friend button on Facebook?

I sent a friend request to my sisti haven't spoken to in 2 years, about 10 minutes later the requested friend button disappeared and all I see now are see options, block or report on her heading. Did she deny my request?

Why after I send a friend request to my sister does it no longer show an add friend button on Facebook?
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