Gomez was scheduled to play at the B96 Jingle Bash 2011 at the Allstate Area near Chicago Saturday and at the 106.1 KISS FM Jingle Bell Bash at the WaMu Theater in Seattle Sunday, E! Online reported.
Seattle's concert was entirely postponed because pop group OneRepublic also had to cancel with frontman Ryan Tedder being ordered by a doctor to go on vocal rest.
Gomez was attending Power 106's Cali Christmas 2011 in Los Angeles Friday when she heard of her mother's unfortunate news. The pop star promptly left the concert and headed home to be with her mother, Mandy, and stepfather, Brian Teefey.