No problem. If you're getting particularly bad mileage even on long, easy runs, you might want to consider getting the exhaust gasses analyzed. They can help detect sub-optimal fuel to air ratios which could be the cause of the poor MPG.
I'm not familiar with the Renault, but there is probably a weight difference between the two cars and the Renault has a smaller engine (was it turbocharged?).
It's possible the EGR on the 1.6D has a thermostat on the EGR, but I can't confirm. It was my impression it was controlled by the ECU which recirculated exhaust gasses based on exhaust gas temperature, engine load and coolant temp, but I could be wrong.
Is her daily commute hilly or flat? You should try running on a flat stretch with easy throttle openings. If everything is okay, you should be anywhere between 58 and 62 mpg I would think (that's in imperial gallons, not US). At least that's what I've been getting pretty consistently since I bought the car in 2009.
If it's a lot of short trip stop and start on a daily basis, then I could easily see her getting mpg's in the 40's to 50's.
I know about the short trips but it gets long road trips every other weekend.
Car never sits idling straight off on drive.
Ill get her to try having the heaters off.
Her old Renault Clio 1.5dci would get o temp quickly and run 52-56mpg on same trips
Only asked bou egr thermostat as my e46 320d has both thermostats