I'm very sorry:hugs
Making that decision must have been extremely difficult, but you did it out of love and compassion for your sweet special girl. She is no longer suffering or in pain.
I'm so very sorry, I don't normally say this, but with that kind of damage, if she were mine, I would put her out of her misery.
If feces is leaking, it's going to be very hard to keep that from getting infected even with antibiotics.
Of course it's all up to you, if you want to try, we will...
I'm so sorry:hugs
If you have updated photos those would be helpful. From the first one you posted, it looks like there is extensive damage to the vent. I'm just not sure how well that will heal.
Do you have a vet that can see her?