UK resident

Dear tutor,
I have a question: why in this case it’s determined that the woman in the text has spent between 46 and 90 days in the UK in the tax year 2023/24?

“In the tax year 2023/24 she visited the UK for 80 days, staying in her UK home apart from the two weeks when she stayed with her 17 year old son who had come to study in the UK.”

For me, the text means that she visited 80 days, in addition to 2 weeks / 14 days with her son. So, the total number of days should be 94 days.

Can you please enlight me in this question?

Thank you!