This is the 2811th most frequent Chinese word.
小心
Be careful.
The word '小心' here means 'carefully', and it modifies the action of walking to suggest caution.
小心地走过冰滑的路面。
Walk carefully across the icy road surface.
The word '小心' is used as an imperative to warn someone to exercise caution regarding the fragile cup.
请小心，这个杯子很容易打碎。
Please be careful; this cup is very fragile.
In this sentence, '小心' describes the manner in which she dealt with the problem, emphasizing carefulness and caution.