She would use her extensive knowledge of magic. For food, she could use magic to conjure or transfigure things. She might also forage for non - magical plants that are safe to eat and use her knowledge of Herbology to identify them.
He might encounter magical creatures that are not known to most wizards. For example, he could meet a rare breed of unicorn or a group of centaurs who take him under their wing and teach him their ways of magic and life in the forest.
She could have encounters with magical creatures that are rarely seen outside the forest. For example, she might come across a group of centaurs and have to earn their trust through her intelligence and respect for their ways.
One possible consequence could be that she gets fired from her position. If Harry manages to expose her actions, the wizarding school or the Ministry of Magic might not tolerate such blatant abuse of power and take disciplinary action against her.
One idea could be a story about a group of young wizards on a magical creature study mission in the Forbidden Forest. They encounter rare and dangerous creatures, like a unicorn herd or a pack of werewolves in their non - transformed state. They have to use their magic skills and knowledge to document the creatures' behaviors without disturbing them or getting hurt. For example, they might use a spell to make themselves invisible to get closer to a shy unicorn. Another plot could be a mystery where a valuable magical artifact has been lost in the Forbidden Forest and the characters must search for it while facing various obstacles like enchanted trees and tricky magical traps. A third idea is a story of self - discovery where a young wizard, feeling lost in the wizarding world, goes into the Forbidden Forest to find solitude and ends up finding a long - forgotten magical grove that gives him the inspiration and confidence to pursue his true calling in magic.
In a non - sexual story context, one of the main dangers in the Forbidden Forest is the presence of dangerous magical creatures. For example, there could be Acromantulas, large and venomous spiders that can be very aggressive. There are also werewolves, especially during the full moon when they transform and lose control. Unicorn hunters, dark wizards who hunt unicorns for their blood and horns, are also a threat. The forest itself can be disorienting with its thick foliage and winding paths. One might easily get lost and run out of supplies. There are also enchanted areas where magic behaves in unpredictable ways, like patches of quicksand - like mud that can suck you in if you're not careful.
His relationship with Hogwarts students would be very different. Instead of growing up with them, he would be an outsider. When he finally meets them, they might be in awe of him or even a bit afraid because of his different upbringing.
Another way Harry could respond is with a sense of shock and disbelief at first. Given that Umbridge is supposed to be in a position of authority, Harry might be momentarily stunned that she would go to such lengths. However, his Gryffindor courage would soon kick in, and he would likely start to resist, perhaps by using his magic in creative ways to protect himself or to disarm Umbridge, all while trying to uphold the values of the wizarding world that oppose such cruel and unjust treatment.