Hello, i feel like i need help from a doctor, my mother has starting to get black lines on her nails. would be really happy if you could help. ?

See a doctor: Splinter hemorrhages look like thin, red to reddish-brown lines of blood under the nails. Splinter hemorrhages can occur with infection of the heart valves (endocarditis). They may be caused by vessel damage from swelling of the blood vessels (vasculitis) or tiny clots that damage the small capillaries (microemboli).https://medlineplus.gov/ency/article/003283.htm

See derm : Longitudinal melanonychia has many causes mostly benign especially in dark skinned people. See derm because pathological causes include melanoma. Usually normal in African Americans. See link. http://emedicine.medscape.com/article/1375850-overview#a4

She needs an eval.: Black stripes down 1 nail may be subungual hematoma. Red or brown streaks may be splinter hemorrhages. Brown/black lines from nail plate to tip are often seen in people with dark skin & are normal. Subungual Melanoma can cause nail ridges & dark colors of cuticle. It most often effects the thumbs or big toes. Dark lines may be due to other illnesses. Get checked out when in doubt.