Unplug the Mass air flow meter and see if it makes it any better, if it does, then you'll need to replace it. Im assuming if its a Pierburg and done more than 50k, then its knackered. If its a Bosch, then id be surprised if its gone below 100k.
The Mass air flow is a little box that sits on on the air intake between the filter and the manifold, also black in colour with a 6 or 7 pin connector going to it. Simply unplug (perfectly safe) and test the car out.
Failing that, you might have a faulty injector(s), if the spring has weakened then the effective duty cycle has been increased, thus allowing more fuel into the engine.
P.S, what mileage has she done?
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