This is one of those situations where you cannot take a chance. It may be life-threatening and it may not be. The problem is that leaking blood in the arm may mean a leak elsewhere.
Okay. That's brilliant help and we will get her to medics right this minute. Thanks very much for such fast advice. I can oddly be much calmer when I know it's time to calmly panic - I just didn't want to panic her with our overly sensitive neurosis and cause more problems. Again, appreciate your help hugely. Big thank you.
She requires immediate medical attention. Yes. It is time for the panic stage. Most likely this is due to the anticoagulent medications. Discuss with her physician the alternative. There are several, including simple aspirin, however according to medical "standard of care" potocols in the United States the physician cannot suggest this unless you bring it up.
Have just discovered she has essential thrombocythaemia if that explains anything...