Drumster is right.Move the accumulated savings to the best online rate. Shop around for a Regular Saver but most are only paying around 7 to 7.5% without conditions.(Brittania B.S.?) Register both for Gross interest (Form R85).
Halifax are getting worse by the day for customer service and interest rates (bonds not bad).Drop them.
ISA probably not necessary unless she intends to save long term.
Good luck.