She's not on a £2k/day salary, that's just the rate paid to Capita, a consulting company. For a senior person (e.g. partner-level), £2k is actually on the cheap end. I went for £400/day 10 years ago as a Junior Software Engineer fresh out of uni, and by the time I left my day rate was about £1k/day.
(My rate was from Accenture - somewhat more high profile than Capita, but shows that £2k/day of chargeout rate is not so extraordinary).
In case this was not obvious, neither myself not Ms Ferguson take home anything close to the day rate - back when I was being sold at £400/day my own salary was a whopping £22k p.a.