Ashley, I'm soo sorry.
It's such a great loss and those that haven't gone through it, don't understand the depth of pain one feels. I just read your other posts. I'm at work w/ tears in my eyes. Your heart must be so broken. I know you feel guilty but you did everything you could and with time you'll come to terms w that.
I had to put down my first dog and a beagle a little over a year ago while he was just a puppy and it was awfully painful, my heart felt so heavy and the guilt was indescribable. Take comfort in those around you and in time you will be comforted by the memories. Do a tribute for her with pictures, like a scrapbook. It will help comfort you. You're welcome to pm me anytime. Hugs