Sid was her father's friend and trusted partner, an uncle who brought her presents and chocolate. His departure from their lives had signaled the beginning of a slow and painful end for her father, but her memories of him were good ones. That was why, even though the message was three years old, she had answered his distress call.
Then she discovered the depth of his initial betrayal, promptly followed by getting her hooked on Flash and trying to kill her.
Power and ambition were more important to him than peoples lives, even his "best friend", and the children he had watched grow up.