About Harley 'derp derp'

I need an emergency foster or someone to adopt my female Pitbull/German Shep mix. She is loyal, and the best cuddler. I love her to death and wish it didn't come to this, but it has. Over the past three years, she became highly aggressive towards my older (now 12 years old) female German Shephard/Queensland mix. No matter what behavioral training or positive reinforcement I have done it doesn't change the situation. If she can get to my other female at all she goes straight to a violent attack of trying to kill her. My husband and I have had gates all throughout our house to keep the dogs separate and away from each other. She is fine with my other male dogs, but not the female at all. I am needing to rehome her asap as she got out of her kennel and attacked, almost killing my 12-year-old female. I am worried about her being a Pitbull mix and all the stigmas that are attached to the breed. I am looking for anyone willing to help that has knowledge of the breed. Her name is Harley 'derp derp' Quinn. I began calling her 'derp derp' due to the tongue that hangs out the side of her mouth that she cannot control. It is by far the cutest thing. She is crate trained and knows how to sit, stay, spin, and wait for her food. She is the typical loving Pitbull that adores cuddles and always greets you happy whenever you come home. She has had issues with strangers, but once she knows someone, she warms up quickly. However, she needs more socializing and interactions with people. I attempt to work with her as much as possible. But with life being busy and having to work in shifts just to be with the two different dogs. It is exhausting and heartbreaking. I have owned her since she was a puppy and her temperament changed around the age of 2 or so. She is 4 almost 5 years old now. Her birthday is September 17th. I reside in Oak Harbor, WA which is a remote place due to it being an island. I have emailed, called, and asked multiple shelters in my area and no one is able to take her. I am looking for any help at all or anyone that can point me in the direction of getting her the best placement possible. This shatters my heart and breaks me into pieces, but it must be done, and it is what is best for both dogs. Thank you for any help, support, and advice.

Island County
Oak Harbor, Washington