A teacher who was laid off after 15 years at the same Chicago school fell short Wednesday in her attempt to pursue a retaliation claim.In a written opinion, U.S. District Judge Marvin E. Aspen held Valentina Sorescu had failed to support her allegation that she lost her position because she revealed administrators at Manley Career Academy High School were manipulating student attendance data.Aspen did hold Sorescu’s statements to a magazine reporter about the purported data manipulation were protected by the First …