In my experience, turkey eggs that are infertile and later on rotten have more of a greenish or grey tint to the shell when candled. at least one of those eggs looks potentially rotten, which would be the cause of a concerning smell. I wouldn't throw it out yet, just in case, but keep it sperate...
Turkey eggs are much more sensitive to fluctuations in position, humidity, and temperature than most other poultry eggs. There is a chance that none of them will hatch--it was a terrible idea for her to sell you 18 incubated eggs. Prepare yourself for the worst--they may not hatch. But it will...