Cervical location is only recommended by the AVMA when the person performing it has been taught by a well achieved practicioner and practiced it many times.
CO2 is a humane method with no risk of complications unless the person doing it really doesn't wait long enough for them to pass.
If it's an open wound absess, I would gas her unless you have means to treat her properly. I just today had to put my oldest breeder girl down. She lived for 2 some years and has been helping out socializing the holdbacks for quite some time now. She also had the start of breast cancer right under her left back leg and she has taken a turn for the worst lately.
It is incredibly hard for me to see them go, but I always defer to them having a good quality of life rather than me attempting to sustain them under less than satisfactory conditions.
Very sorry to hear your girl isn't fairing well.
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