Depression is not a easy deal... Good thing is that anyone can get out of it , your only enemy are your thoughts and your friends should understand there is a battle to be fight in front of her, it will not be an easy fight but in the end she knows her opponent more than anyone else... I've dealt with slight depression sometimes so im sure i'm not someone who can actually speak about it or give advise, but as in everything else in life willpower is what makes the difference.