This cabinet card appears to portray Katie Earl.
Unfortunately, I was not able to find a suitable Katie, Kate, Katherine, Catherine, etc. located in or near Mt. Pleasant, Michigan, where the photo was taken.
The photographer is probably Ross Williams (you’ll notice the initials R W in the monogram), who is found living in Mt. Pleasant, Michigan in the 1900 census, age 39, with the occupation of photographer. I was not able to locate him before or after 1900.
1. 1900 U.S. census, population schedule, Mount Pleasant Ward 2, Isabella County, Michigan, enumeration district (ED) 74, sheet 8B, dwelling 194, family 205, Ross H Williams; digital images, Ancestry (www.ancestry.com : accessed 20 July 2013); citing National Archives and Records Administration microfilm T623, roll 718.