PLease research the following topics:
Central Cyanosis
Methenoglobinemia
(Nitrate/nitrite poisoning)
Do you have well water? High nitrite/nitrates in water and also any coliform bacteria can cause Methenoglobiemia (decreased oxygen carrying capacity of hemoglobin).
Have your doctor test her blood for methoglobin levels.
Avoid carrots/spinach/celery/cabbage.
Beleive it or not even municipal water supplies can be contaminated. The last time I checked Livermore's water we had freon, of all things, in our water supply... and also we were above recommended safety limits on nitrites / nitrates.
Deep vein thrombosis (Blood clots), heart murmers, epiglotitis, can also contribute to cyanosis. I also believe certain bacterias in the blood / body can contribute to poor circulation problems. Certainly bacterias have been known to affect heart and veins.
Kind regards,
Gail
ps..try Organic live Manuka honey internally 4 x or more a day- which oxegentates and kills bacterias. (you can always find it online..I think vitacost.com has it at a good price )