Is Rhondas filing status single or head of household? Is Mabel a qualifying relative?

Rhonda Hill (unmarried) is employed as an office manager at the main office of Carter and Associates CPA firm. Rhonda lives in a home she purchased 20 years ago. Rhondas older cousin Mabel Wright lives with Rhonda in the home. Mabel is retired and receives $2,400 of Social Security payments each year. Mabel is able to save this money because Rhonda provides all of Mabels support. Rhonda also provided the following information:

Rhondas birthday is 12/18/1952 and her Social Security number is 335-67-8910.

Mabels birthday is 11/2/1944 and her Social Security number is 566-77-8899.

The exemption for the qualifying relative for 2019 is $4,200.