Analyse friendship between Sue and Johnsy."The Last Leaf" by O.Henry

In O. Henry's poignant story in which two young aspiring
artists become "congenial" enough to find a studio apartment together in Greenwich
Village, Maine-born Sue worries about her Californian friend, Johanna, whom she calls
Johnsy.  For, Johnsy has contracted pneumonia in the cold November of New York.  Having
called a doctor to their studio, Sue learns from him that Johnsy has only a slim chance
of living because she has lost her will to live.  He tells Sue that she must get Johnsy
interested in something that will inspire her to get
well.

Now, Sue is a true friend who dearly loves Johnsy. 
She tries to motivate Johnsy by humming and being cheerful as she sits by her friend
drawing.  But, when she realizes the Johnsy has counted the leaves that have fallen from
a vine, she "looks solicitously out of the window."  Calling her friend "dear," Sue asks
Johnsy what she counts.  When Johnsy tells her that with the fall of the last leaf from
the vine she must go, too.  Sue acts scornful of "such nonsense"; speaking positively,
she tells Johnsy that her thoughts about death are "naughty."  For, says Sue, who lies
in order to convince Johnsy, the doctor has said that her chances of getting well were
"ten to one."

Sue pretends that the situation with Johnsy
is not of the magnitude that it is; in her love and hope, she acts as though Johnsy will
soon be well.  However, she is truly worried.  So, she begs Johnsy to close her eyes
because she needs the light in order to continue her drawings.  Johnsy agrees, but she
tells Sue to hurry as she wants to go down like the last leaf. she goes to Mr. Behrman,
informing him of the gravity of Johnsy's condition, hoping there is something he can
do. Angered that Johnsy is ill,  Behrman complains, then, comes to pose, Sue takes him
outside to look at the barren vine with one last leaf. 

So
greatly concerned is Sue about her friend that she effects the change in Johnsy's psyche
that causes her to become well. Sue's determination to do what she can for her friend
saves Johnsy's life.  There is no doubt that Sue loves Johnsy as she has thought about
what the doctor has told her and done everything she can to save Johnsy, even convincing
Behrman enough that he paints the last leaf onto the glass of the window
outside.