You could likely get what you want by tweaking the EQ at that
point, instead of just cranking the volume. It's a little hard to give exact directions without hearing the singer, but I'll give you a place to start from.
If the EQ on her
channel has what's called a "sweep mid" you can not only turn the mid frequency up and down, but also change what that frequency is. Most of the time for a female vocal, for example, I'll set the mid
gain to -6 or so and try the mid frequency anywhere between 400 Hz and 1.5 kHz. That can take the tinny or shrill aspects of the female voice out and
reveal the warmth of the lower register that they were covering up.
So, to give your Millie some
power in that section, set the mid
gain to boost a little, like +3, and sweep the frequency back and forth between 200 and 600 until there's love commin' out. Then just save your settings and treat it like another
cue. If your
console has a four band EQ with no sweep, just touch the low-mid knob. If you've only got a three band, the mid is likely around 1.5 kHz and won't do you much good, boositng that will just make her shrill. The low knob could be anywhere from 80 to 300 which may do it for you, but may also make her boomy or cause bad
feedback in the
system. Try and get 15 minutes where you can work with just her in the empty aud. Have her run that section a few times while you tweak and when you're done, tell her she sounds great!