You mean Serena's mother from the Moon Kingdom. Isn't it Queen Serenity. Look at this [link] if you want to. Because Sailor Moon (Serena or Princess Serenity oddly have the same name or are you going with mythology of the Queen of the Moon.
Ok. I was just wondering. So in Japan Princess Serenity's mothers name is Queen Serenity, but in the US it is Selena right. But I remember in the US version of Sailor Moon Season 1 episode 35 that Luna called Sailor Moons/Serena/Princess Serenity's mother by "Queen Serenity" not Selena. It doesn't matter to me but I am just trying to understand the difference. And here on Wiki, I know it is not that reliable link ([link](season_1)) Ep 44 summary states "A blast of energy sends the Senshi to the ruined Moon Kingdom, where they meet a hologram of Queen Serenity and learn about their past. Luna and Artemis find the entrance to the Dark Kingdom. Kunzite attacks." I am just giving you the reason why I believe that it is Queen Serenity not Queen Selena. But it would make it much easier if they just called her Queen Serenity in the US version. Right? LOL!!! But it is your artwork not mine.
In our translation (Russian) quote - "I'm queen Serenity, the incarnation of the moon goddess Selene, and your mother" I watched the German version - there she called only Selenium. Yes, and Russian translation of the manga she is Selena too