He said "but it's bothersome enough to me".
The gremlin lives somewhere between 5 and 10 kHz. The best I've been able to do is put a -24dB notch at 7kHz with a Q = 0.9
This doesn't entirely remove it but it's less bothersome.
Any significantly different center frequency or Q value steps on her vocals too much and the "cure" becomes worse than the "disease".