If it is in fact a "standing pilot" furnace it will have a thermocouple and if so, once the pilot is lit it takes several seconds for the millivoltage of electricity to be generated strong enough to hold in the safety coil in the gas valve. So, did she keep the pilot knob or button depressed for maybe 10 seconds before turning loose ? If she did and it still does not stay lit, replace the thermocouple. You'll need a 3/8 7/16 and a long phillips or long 1/4" nutrunner. And a flashlight unless you can see better than I.
If it is not a true standing pilot it will probably be a glow coil with a direct ignition sequence. Meaning the inducer motor will start and first go through a pre-purge sequence, send power to the glow coil ignitor which will cause it to glow bright orange. Then the main valve will open once the feedback tells the circuit the glow coil is energized. The main flame is then ignited by passing a portion of the gas over the hot surface ignitor and if not, the flame rectification circuit in the control board will close the main gas valve and lock out the gas flow. The glow plug also serves as the flame rectification circuit. If its a hot surface ignition type of furnace, chances are the igniter is bad. If it is and you can obtain a replacement, DO NOT touch the ignitor surface of the new one with your fingers as it will cause premature failure.
Most furnaces will allow this to happen three times, then lock out permanently, send a code to the circuit board and power has to be reset to reestablish an attempt again. Then repeat.....
First thing to do on an electronic ignition furnace is to look through the (typically) provided peep hole and see the flashing diode/diodes, count them then look inside the door for the failure codes.
Anything beyond that, you may ought to call a qualified tech.
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