Tolkien's intent for Galadriel as she appears in Lord of the Rings is exactly what appears in Lord of the Rings.

The Silmarillion was his unfinished writings. I don't recall whether he had any intention to ever publish it, but certainly, he did not make strong efforts to do so. His son Christopher had to make a monumental effort to take the various disparate scraps and versions of stories to put them together into what appears to be a coherent whole.

To say that Tolkien "intended" for Galadriel to present, in Lord of the Rings, any of the traits one would associate with a kinslaying ruthless warleader is to completely ignore the context and the manner in which he wrote those two different aspects of her.

Ehh....Gandalf himself says that if he took up the Ring he would in time be corrupted. I'm not going to say it's wrong to read Galadriel's speech there as, in some way, referring to her checkered past, but I've never read it as indicating that.

Basically, anyone with a personality built for command, taking up the Ring, would become a tyrant of some sort. That's part of why it was so important that it came not just to hobbits, but to these hobbits, whose strongest desires were about protecting, and gardening, and living their hobbity lives. (I imagine if Lobelia Sackville-Baggins had gotten her hands on it, she wouldn't have fared so well. Not a Dark Queen by any means, but still something much more dark and dangerous than what became of Bilbo, Frodo and Sam.)