وَقَالَتْ لِأُخْتِهِۦ قُصِّيهِ ۖ فَبَصُرَتْ بِهِۦ عَن جُنُبٍ وَهُمْ لَا يَشْعُرُونَ
Waq a lat liokhtihi qu ss eehi faba s urat bihi AAan junubin wahum l a yashAAuroon a And so she said to his sister, "Follow him"-and [the girl] watched him from afar, while they [who had taken him in] were not aware of it.
 - Mohammad Asad
She said to Musa's sister: "Go, and follow him." So she (Musa's sister) watched him from a distance in such a way that the other did not notice it.
 - Muhammad Farooq-i-Azam Malik
And she said to his sister, 'Keep track of him!' So she watched him from a distance, while they were unaware.
 - Mustafa Khattab
And she said unto his sister: Trace him. So she observed him from afar, and they perceived not.
 - Marmaduke Pickthall
And she said to the sister of (Moses) "Follow him." So she (the sister) watched him in the character of a stranger and they knew not.
 - Abdullah Yusuf Ali