There are surprisingly few collections of works and speeches made by Elizabeth I. The following books may prove useful.

Maria Perry, Elizabeth I: The Word of a Prince

A Book of Devotions composed by Her Majesty Elizabeth R (limited editions)
Collection of prayers written by Elizabeth I

Harrison, G. B., The letters of Queen Elizabeth (out of print)

Bradner, Leicester, ThePoems of Queen Elizabeth (out of print)

Also I would recommend the new book on this subject Elizabeth I: Collected Works  edited by Marcus Leah S., Janel Mueller, and Mary Beth Rose.
 
 
 
 
 
 
 

If you can't find what you are  looking for, try searching on  the world wide web:   Web www.elizabethi.org