She does not have to be secretive - she has no enemies, her world is accustomed to the introduction of strange wonders and will not fall apart with any revelation. She revives a large number of dead people - although none of Marianne's direct ancestors - and sends them home to surprised but happy families. She renders a larger number of people torchable. She sends letters to the monarchs of neighboring realms indicating that she is available to help with any unusual difficulties in which they may find themselves, and that she would appreciate introductions to their farther-flung neighbors. That is the "a lot".
But her world is made of cotton candy, and she has no intention of dumping a bucket of water on it in the hopes of rinsing off small amounts of dust. She is not usurping her mother-in-law, she is not conquering miscellaneous other kingdoms, she is not ridding the world of all its annoying but ultimately not mean pitfalls and hazards. (She does make it a condition of rendering dragons torchable that they must not eat anyone except trespassing Orthodox wizards.) She is mostly staying at home with her wives and her daughters, reading Rose's books, chattering endlessly with Kanim about all the exciting experiments they'll conduct with the new forms of magic available.
When Jane goes down, Bella has to make sheepish announcements that her resurrection powers turned out to be impermanent; she hopes they will return but can offer no timetable.
Meanwhile, news of one specific resurrection (Howard's) has spread far and wide.
"Teeny people!" cries Kiawen. "Elves. Smaller! Double-elves, so high!" She holds a hand at her own knee level.
"Ordinary-sized people," laughs Bella. "They just live close together in cities, instead of all spread out like in the Enchanted Forest."
"They still have their own rooms per person and houses per family," says Bella. "The houses are just right next to each other."
"Duchess Kiria is going to bring her children to meet you. They're twins - regular ones - and about your age."
Kiawen is so optimistic that she's out in front of the castle, playing with Cricket, when the visitors arrive, instead of waiting for them to knock.
"Hello!" the man says cheerfully. "Are you by any chance a princess?"
His daughter giggles.
Kiawen grins and hugs Cricket for no particular reason; Cricket tolerates this. "Yes but which one?"
"That's a hard question!" exclaims the man. "I didn't know there would be hard questions."
"You didn't even need all three!" says Kiawen, letting go of Cricket to clap for him. Cricket tends to his much-abused fur.
"Boo," says Valeria gleefully, waving her arms.
"I'm not very terrifying, he's just being silly," says Icarin.
"I'm not even a bit terrified. Hello, it's nice to meet you! Carinna says I should find out if you are nice so she can stay away if you are not nice," says Kiawen. "She only likes nice people."
"I don't know if I'm nice," Icarin says thoughtfully. "How do you tell?"
Valeria cackles.
"Mow," says Cricket, and he lopes castleward.