Maria Margrithe (Maggie) Sanburg is the fifth child born to John (34) and Maren (29) in Racine, WI. Maggie married John Bernard Lawler in 1895. The man in the photo with Maggie is unidentified. The flag in this photo is the 45-star US flag used from July 4, 1896 to July 3, 1908. The photo is calculated to have been taken on or around Saturday, July 4, 1903.

Maggie died of acute gastritis. Gastritis is actually a fairly general medical term that describes a number of conditions that all have one common condition, the lining of the stomach is inflamed. There are multiple factors that cause acute gastritis:

1) Bacteria - Gastritis inflammation is often a result of an infection. This infection is typically caused by the same type of bacteria that causes the majority of stomach ulcers. The most common cause of gastritis throughout the world is a bacterial infection caused by Helicobacter pylori (H. pylori)
2) NSAIDS - Non-steroidal anti-inflammatory drugs or NSAIDs include indomethacin and aspirin.
3) Excessive alcohol use
4) Radiation exposure
5) Physical injury to the stomach
6) Chronic stress
7) Cocaine - From the 1850s to the early 1900s, cocaine and opium-laced elixirs, tonics and wines were broadly used by people of all social classes. Cocaine was not officially banned until 1922.
8) Bile Reflux
9) Autoimmune Conditions
10) Crohn's Disease
11) Irritable Bowel Syndrome
12) Unhealthy Diet

It was probably a combination of several of these factors that affected Maggie's death. She died on her birthday. Her birth year is 1879 per her baptismal record at Resurrection Lutheran Church. Maggie's obituary also lists her age as 37 which is in line with the 1879 birth year. Her grave marker says 1877, but I think this is inaccurate. The spelling of her middle name is also from her baptismal record.