Assumptions:
Lets assume the voltage of the stun gun is 50k volts(which is usually the case for a low end one).
Stun guns usually have a current of 3 milliamps(0.003 amps).
The frequency of a stun gun is also around 19 Hz, and the duration of one pulse is usually 105 microseconds(0.000105 seconds).
She held the stun gun to her pussy for around 7 seconds.
The total duration of electricity going through her pussy is: frequency * time * pulsetime = 19 * 7 * 0.000105 = 0.013965 seconds of contact with electricity.
Lets calculate how many watts this stun gun is: 50000*0.003 = 150 watts.
According to google it takes 13.1 watts of electricity for 1 second, or 1.31 watts for 10 seconds, ect to kill a human. Those values are inversely proportional, k = x*y = 1*13.1 = 13.1
Lets calculate the watts required to kill a person in 0.013965 seconds:
In inverse proportionality y = k/x, here k = 13.1 and x = 0.013965 sec
y = 13.1/0.013965 = 966 watts.
Conclusion: the woman survived, since she only recieved 150 watts of power to her pussy, while you would actually need 966 watts.