They wished her luck and ushered her in front of the fireplace. This gave her the confidence she needed in order to continue on with her plans. Fred and George wouldn't let her go alone if they knew she would be in any apparent danger. They wouldn't let her go at all, actually. So, their casualty with the situation deeply guaranteed her safety. But just as they were about to cast a glamour over her to keep her identity concealed while on her trip, Molly walked in with a slightly panicked Mitchelle.