The singer admitted that she is in "utter disbelief" producers won't provide any family members with tickets, meaning she would have to leave daughter Caiden at home if she attended the event in Manchester.
"Looks like I won't be at the final either now... #itsajoke," Ellis tweeted.
"Over it... I would have love to go but I have no intention on leaving Caiden for three days!!! No tickets for family!! #terrible."
She added: "In utter disbelief tbh... #shocked #disappointed."
Ellis left The X Factor back in October, and recently performed at G-A-Y with fellow contestants Lucy Spraggan and Rylan Clark.
Watch her singing 'Love Is A Losing Game' below: