If a person was working at a temp to hire job and was given a hire date but was terminated after employer found out she was pregnant is there a case

My daughter worked at her job twice. Once in April 2015. She was terminated the first time due to attendance. She was rehired in October of 2016. She was given a hire date of April 12th but Supervisor stated she forgot when my daughter asked on May 16th. She was told that day that it would be processed when the head of the department returned to work on May 16th. My daughter found out she was pregnant on May 17th. On May 19th she was terminated. Reason given was attendance however she had only called off 1 time during that period which was the day she was terminated.