Because she wants to remain fit and refresh in the morning & she gets tired at night
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same ans!!!!!!!!!!!!!!!!!!!!!!!!!1

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the women might be a dwarf so if she is a dwarf she cannot reach the 45th floor button of the elevator so she uses the stair case and in the night she used the elevator because the ground floor button would be down.

hope so my answer is useful......^_^
Okey buddy... :) :)
thnx dear !!
nice ans. hahahahahahaaaaaaaaaaaaa!!!!!!
umm why to laugh what is so much funny in this answer ????
this above comment is for aparnadurga