In UAE I want to check if my sister have travel...

you can inquire about the travel ban through the following link:
Check if you have a travel ban - The Official Portal of the UAE Government

Or through a query from the Ministry of the Interior and still prevent travel on you first remove the reasons for prevention as it is required to remove the travel ban the absence of illegal practices for those who request removal of the ban and after removing the reasons underlying the decision to prevent security You can apply to delete your name from the lists of the prohibited in the competent security authorities.