Colleen
Coleen is found in the park by hunting for the "womanfruittree" event. This event only activates after viewing the "Military activity" event in the outside exploration area until the scene with a paratroop drop. When rescued from the tree, she will return with you to the bunker.
Coleen is initially uninfected and not available for sex. This can change depending on how you interact with Sarah. If Sarah is turned into your sex pet, Coleen will become infected as well and fall into depravity, allowing the player to have sex with her.
To turn Coleen into an Alpha you need to keep transforming her, but at the point when she asks if you'll be her master refuse. This makes her into 'Coleen the Stray'. You then need to have sex with her while being female. At that point, she should ask if you want to be a slutty husky as well. If you agree, she'll become the alpha female and will be infecting you with 'Female Husky'.