If the lines are gelled, the block heater wont do anything. Spin off the fuel filter cap and see if the fuel is liquid in the filter. If it is gelled there, chances are the lines are gelled also. Either wait it out for the weather to change, get it towed to a warm garage or shop, or tent the car with a heater. Gotta warm the lines up to ungel what is in there before any kind of 911 treatment will do anything.

Get your girl a bottle of treatment and explain why it is important to use it regularly. With the size of the tank on a jetta, it only needs a splash. One bottle will last all winter.