From your statement I can come to a conclusion that what your mother is having condition called spider veins
. Occurs due to weakening of the circulatory system. the cause for this are many - few of them are age,heredity, lifestyle, environmental factors and sun damage. All have an effect and can cause stress
on the vascular system. Certain causes may not be applicable for your mother's age, but common for women. The hard work may be the cause for this as well for the neck pain
and arm weakness. Ask her to avoid hard work. High BP
and cardiac stent are usually not the cause for spider veins.
If left without treatment it may spread around. If at all treatment is needed - sclerotherapy
by vascular surgeon. otherwise nothing to worry.