for the past week she has been up all night for hours at a time crying. we feed her, change her,…

for the past week she has been up all night for hours at a time crying. we feed her, change her, play music and let her cry for a few minutes and we give her the pacifier and nothing is working. all she is doing is crying. any ideas on how I can get her to sleep?? I try keeping her up as much as i can during the day but it doesn't work. she is still up crying all night.