I think a doctor's visit is in order.
Hands can go pale, and then warm up and get pink.
But blue, means it is either more serious, or the venous blood
is not returning to the heart properly.
Raynaud's where hot and cold alternate is pretty common in women. But if only one hand is blue, that seems more serious IMO.
Have her try soaking in lukewarm epsom salt water for 20minutes.
Use some kind of pan, and watch TV or whatever. Keep the water warm, and use about 2 ounces of the salts depending on the size of the pan. Do not use hot water, as it can burn the skin etc.
If the epsom salt soak works, that suggests a circulation problem.
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