I’d consider anyone surviving an out of hospital cardiac arrest as a miracle. If I remember your original post correctly you were doing CPR for 20 minutes. That is heroic and defies the odds in and of itself.
My point is there should be no thought in your mind that you could have done more. Keeping her going for 20 minutes until she could get more advanced care is miracle enough. I pray that she recovers and that you can find peace.