Question

chage into indirect speech = She said "Please lend me your book

Answer 1

The answer is: She requested him to lend her his book.

From direct speech, the sentence is changed into an indirect speech sentence.  

The meaning has kept unchanged and the right approach of the sentence is maintained.

For example, she has raised a request, hence the word requested is used to explain the approach.

Here the verb lend has been maintained in the converted sentence.

Answer 2

Answer:

she is requested to lend her book