"Queen is a benevolent, if somewhat airheaded, person. While she is the main antagonist, it is mostly out of lack of insight rather than malice. She seems reluctant about controlling people she likes, and would rather they willingly go along with her plans to make them happy. She is also prone to giving people pet names and describing them using fun adjectives. She genuinely believes she is doing the right thing by opening Dark Fountains, and after she learns the truth of the Roaring from Ralsei, she recognizes that she was misguided and immediately stops her plan." (Queen WIKI)

Text- Tone Reference: https://www.youtube.com/watch?v=jZHL1VyMtcM (This is not just her text tone, but her text tone is in there! ;) )

Although she is implied to be drunk most of the time, her voice would still be monotone in the sense that it has little to no pauses between words and little inflection. Her voice regardless would probably be big and demanding attention! Experiment with this kind of voice. I know it seems difficult but I know you can do it!

Good luck!