no need for tb, that is only for applicants that will stay 6 months or more in the uk. cfo as well are for filipino spouses or fiancee who are migrating to foreign countries.

make sure your mum has enough money for her expenses whislt in the airport etc. if the documents from vfs was returned to our mum, tell her to carry them as sometimes immigration in the philippines and in the uk will ask for invitation letters etc. just tell our mum not be nervous whilst facing immigration officer, they wont bite. good luck to her and hoping she will enjoy her journey.