Well, even though you didn't share the expert here, I can help you cause I've recently made an analysis of this speech. As for me, in this part of her speech " and therefore I am come amongst you, as you see, at this time, not for my recreation and disport, but being resolved, in the midst and heat of the battle, to live and die amongst you all; to lay down for my God, and for my kingdom, and my people, my honour and my blood, even in the dust." she shows her strong will to fight and protect her country at any cost, expressing her loyalty to the people. She also emphasizes that they are being on the same level and those words encourage her warriors to perform their duty.