After as little as six months, the woman would develop darkening and discoloration of the skin and, predominantly on the hands and feet, raindrop shaped skin bumps resembling corns or warts. Her breath and urine would smell like garlic and she would experience night blindness. Her fingernails would show horizontal white lines called Mees' lines. Eventually, she would become partially paralyzed and liver and kidney functions would deteriorate.
To see photos of some of these manifestations of chronic arsenic poisoning, click here
If she were to take too much arsenic (and this actually happened to several unfortunate young ladies) she would experience acute arsenic poisoning characterized by headaches, confusion, severe diarrhea, drowsiness, convulsions, and death.
For additional reading and references, see the Extras section