High small car up to 600€

Hello, my mother’s Corsa B won’t come through the TÜV in the autumn without investing a lot of the vehicle’s value. However, he’s been ticking a bit lately, so it can/must be faster if necessary. So I would like to find out slowly which vehicle could succeed. The Corsa has been enough in size, but the new one is supposed to be a little higher to make it easier for her parents (80+). She just drives 18.5 km to work (road), 3 km for shopping, or sometimes 20 km into the next city. It does not attach importance to a sophisticated equipment, nor to optics or a special factory. It is important that it is inexpensive in maintenance (consumption, insurance, tax, as little as possible in the workshop etc.) and durable. Your specifications: – 5000-6000 € – 4/5 doors – “higher small car” – max. 10,000 km a year – cheap in maintenance – durable Do you have suggestions? Thank you in advance.