I'd make an appointment with the school and her and then put it out there - this report says that she doesn't do her homework but she tells me that there isn't any...I'm having difficulty understanding what is going on.

Then ask the school if you can have another appointment in a month to follow up and see if there has been progress. And in the meantime come down on her like a ton of bricks and insist that she sits at the dining table and does her homework every night (or wherever is practical) and that you are happy to assist or proof read things etc.

14 is sort of a make or break age - good habits now will help her do better later on - but not learning to learn now will mean that it just keeps getting harder.

Also, maybe make a deal with her, if she does an hour of homework every night she can have Saturdays off, or can come home later or do something like that.