Since I have seen it in the other Al Zahbi Lamia NM information that #4 does not use charm-ga I will put my 2 cents in.
She uses it but not as often as the others it seems.
In the last Besieged one of the Generals was near her when I can charmed.
Needless to say a 68PLD/34WAR is like a fly on the wall to the generals, he just ignored my critical hit of 1 and pressed on attacking #4.
One thing I noticed though was the tendancy to pull out my sword then immediatly put it away again when she had charmed me. Happened about 5 times in a row. Glitch maybe or just a bored lamia?
Vehrens-Carbuncle