Which lines in this excerpt from the play support April's claim?

Where are the lines in the excerpt

The lines in the excerpt from the play that support April’s claim is this:

" And, if I fall not in my deep intent,

Clarence hath not another day to live:

Which done, God take King Edward to his mercy,

And leave the world for me to bustle in!

For then I'll marry Warwick's youngest daughter."