Is the questioner considered a sinner for leaving her parents alone in Baghdad and moving to live and work in northern Iraq, knowing that she communicates with them constantly and visits them and they visit her?

There is no sin in leaving one's parents alone if they are not in need of care and do not object to the travel. However, if they are in need of care, one can cooperate with a sister or brothers to provide someone to serve them, while striving to be dutiful and benevolent towards them and maintain ties with them as much as possible, taking into account the regulations governing women's work.