Student Finance Postgraduate loan extension

What are the conditions around getting student finance to provide funding for an additional module on top of already paid for a masters course?

My niece completed a masters year in psychology, but had to retake the year due to health issues and covid. She has been told that she can retake the year with attendance in only one module, which costs £1600. Can student finance support this on top of what they have provided for the previous year? For additional information, she has autism, add, and diagnosed mental health conditions.