Well, Haibara's reaction is valid though. Someone whose presence itself posed a threat who exudes intimidating pressure, she had reasons to feel fear. Also, that shouldn't be the basis for Conan to accurately figure out there's a Black Organization nearby just because of purely 'sensing' them.
For those who already know Haibara's tendencies whenever a Black Organization member is around, she instinctively trembled in fear and helplessness which her reaction proves that Black Organization isn't to be trifled with or to be taken lightly. Just by their presence around, for her, it was an alarm that felt like a warning.
A signal she couldn't shake off, but she did dismiss that possibility it wasn't them. Because she is slowly leaning on her normal life that she could no longer be paranoid in every second. She had longed to live a normal life without being haunted by ghosts of fear that keeps hunting her, and we readers could feel her desperation to get away from the scene.
Maybe Haibara didn't want to think about it because she wouldn't want to worry the kids. After all, she is older than them by real age so she had to act calm and stay grounded and not letting herself being clouded in fear.
For those who already know Haibara's tendencies whenever a Black Organization member is around, she instinctively trembled in fear and helplessness which her reaction proves that Black Organization isn't to be trifled with or to be taken lightly. Just by their presence around, for her, it was an alarm that felt like a warning.
A signal she couldn't shake off, but she did dismiss that possibility it wasn't them. Because she is slowly leaning on her normal life that she could no longer be paranoid in every second. She had longed to live a normal life without being haunted by ghosts of fear that keeps hunting her, and we readers could feel her desperation to get away from the scene.
Maybe Haibara didn't want to think about it because she wouldn't want to worry the kids. After all, she is older than them by real age so she had to act calm and stay grounded and not letting herself being clouded in fear.