Sacha Dean, 26, of Arthur Berry Way, Stoke on Trent, was behind the wheel of a 68-plate Mercedes A-class on the motorway near Great Milton on November 18 last year when she was clocked speeding.
A speed gun showed she was doing 86mph on the 70mph limit road.
The magistrates in High Wycombe banned her from driving for six months, after refusing to find that others would face ‘exceptional hardship’ if she were disqualified from driving.
She was banned under ‘totting’ rules, with Dean having racked up 12 penalty points on her licence.
Dean was fined £249 and ordered to pay £190 in costs and surcharge.