The 'Neverending Story' doesn't disclose Sebastian's mom's name. There are many elements in the story that are central to the plot, like the journey through Fantasia, the encounters with various magical creatures, and the growth of the main characters. But Sebastian's mom's name simply isn't one of the things the story tells us. It might be a mystery left by the author, or perhaps it was just not relevant to the overall theme of the magical adventure in the story.
I don't think so. The Neverending Story is about the magical world of Fantasia and the journey of Bastian. Sebastian might be a side character, and his mother's name doesn't seem to play any significant role in the story. The story is more about the quest, the characters like Falkor, and the fight against the Nothing. So, Sebastian's mother's name is not important in the context of this story.
I'm not sure as I don't recall Sebastian's mother's name being specifically mentioned in The Neverending Story. It could be that it was left unnamed in the story.
Sorry, I don't know. But you could try looking for fan theories or reaching out to fellow fans of The Neverending Story to see if they have the answer you're looking for.
Sorry, I have no clue. It's been a while since I read it and that detail slipped my mind. You could try looking it up on fan forums or dedicated websites for The Neverending Story.