My Mother Stopped Her Menstruation 10 Years Ago. This Month,

My mother stopped her menstruation 10 years ago. This month, she had bleeding. Gynecology ultrasound report shows that her uterus is normal in size, anteverted with posterior upper corpus intramural myoma nodule meas 1.2x1.1x.06cm. Her ovaries is thin and intact. Both ovaries are normal. No fluid in the cul-de-sac. .. What treatment should she undergo? How can we prevent this from worsening? Is this serious? Can it lead to other diseases? Thank you very much.