Does a girl's feeling the presence of someone beside her or being touched by him unintentionally necessitate ghusl, especially if that person is thinking of her, and does this feeling indicate that that person is indeed thinking of her?

The feeling mentioned does not necessitate ghusl (definition) (ritual bath), as the things that necessitate ghusl are specific and well-known, and this is not among them. It is advisable to disregard such thoughts and whispers (waswas), because dwelling on them distracts the soul from what is beneficial and may turn into a means for committing forbidden acts. This feeling does not indicate that the person harbors such thoughts.