no question is stupid...thanks how we all learn 
 
im tired.
 
she says she is tired.
 
she said she was tired.
 
we backshift when the principle verb is in past in this case said. 
 
present changes to past
 
i love pizza------- she said she loved pizza
 
past                    to past perfect
 
i did my homework ---- she said she had done her homework
 
present continuous to past continuous
 
i am studying for my exam ------- she said she was studying for her exam
 
present perfect to past perfect
 
i have seen the movie twice ------- she said she had seen the movie twice.
 
present perfect continuous to past perfect continuous 
 
i have been working alot lately -------- she said she had been working alot lately
 
 
will changes to would
i will go to france ----- she said she would go to france
 
can changes to could
i can dance well ------- she said she could dance well
 
may changes to might
i may go to the party. ------she said she might go to the party
 
must changes to had to
i must work today ---- she said she had to work today.
 
i hope this is useful for you and if anyone would like to add 

ime