What are the connotations of "Heilichi", that Bisyah said to Yocheved?
Rashi: "Heilichi" 1 is a contraction of 'Hei-Shelichi' - 'Here is yours!' Little did Bisyah realize the implication of what she was saying.
And not Hey Lach" (See Sifsei Chachamim).
Why must the Torah tell us that Bisyah said that she will pay her to nurse Moshe?
Hadar Zekenim, from Sotah 12b: This teaches that not only do Tzadikim get back what they lost - they even gain through losing it!