Darden's sister

IM NOT WRITING FOR THIS STORY ANYMORE, SO TAKE THE STORY IF YOU WANT!

What if Andy Darden never died?

Gabriela Dawson left Chicago to be on her own, without family and friends.

What would have changed at firehouse 51 if Andy Darden didn't die, how would things be between Casey, Severide and Darden.
How would things be at 51 if Andy Darden's sister shows up at the firehouse after over 7 years she has been away.
Will some people stay as friends or as more then friends?
New best friends.

I don't own any of the one Chicago characters, I only own Brooklyn Darden.