I think she believes that it is a sensitive issue. The military and the Burmese government have brainwashed, so to speak, the Burmese population and the majority of the Burmese population who are not in favour of the Rohingya.
Aung San Suu Kyi appears to be walking a fine line, because she may feel that it is a sensitive issue, and she will not get support from the general Burmese population or the military government if she says anything that might imply justice for the Rohingya. They would think it is favoured.