Well , she did put a brake on it but the car couldn't stop at the right time, so agreed damage was done, but I guess this confidence of asking any question related to BP is given to Suhana by BM herself, where as RB has never mentioned (thankfully) to Suhana about her ordeal in detail , so as she is able to ask BM anything , that's what she did but realised slightly late that she is not alone, as if she was alone BM would have given her the details. That's my point of view, not being pro anybody, Suhana will never be shown serious or any progression towards maturity is out of question as public like cute, Suhana . And we don't count as public.
Why does being cute have to mean dumb? The writers should know that mature people can be just as cute and mature at the same time, if they knew how to balance the character!