After we have started cooperating with Dweena, we continued having our meeting in secret. She would secretly go to the forest while I teleport there at least once every few days.
The magic device she had is disguised so well so that no one would notice that Giselle could see and hear anything from there. And yes, it's just a phone. A phone with modified magic circle by Dweena herself that made it impossible for it to be tracked except for Giselle. And other giants will have difficulties locating it.
Seems like other giants have adapted to modern world as well that most of them have phones in their pocket. And thanks to the internet, some giants turn lazy and don't wish to destroy the world. But for enslaving humans, they might be interested because they want humans to create more entertaining content in the internet.
…Is that a real reason? Seriously?