Wrongfull Termination?

"Attendance" was the reason for being terminated. "Paid time off" is accrued and is defined as such, not vacation or sick time, at this company. At the time of my termination I still had "PTO" available to me and have been told that I would be paid for that time. In the year and a half of my employment there I had received a 10% raise, 2 bonuses totaling approximately $5,000 and only one very high performance appraisal. Upon being notified of my termination (with out warning) and the reason why, I was told that my performance, knowledge and ability to do the job had never a factor. And have been since told by my ex boss that "coaching" was and option for her but she elected to terminate me because "coaching" required to much effort and would be to stressful on her. This took place just after reading an e-mail that was sent to us (supervisors) from HR stating that we needed to prepare for the up and coming performance appraisals and that we should plan out a "coaching plan" to ensure that any employee that is not performing will have adequate time to reach a satisfactory level.