Hi,
Be sure to use a reputable person to carry the piercing out, and be aware that healing time is longer for people with diabetes. I notice that you say your daughters blood glucose are between 10-14, these levels are far to high, and it would be advisable that you and your daughter discuss this with her diabetes consultant or nurse to bring these levels down. Until her levels are stabilised, I would put off the piercing and consider it at a later date.
With good blood glucose control, recovery time will be less than when are running high, so do please bear this in mind.
Nigel