Sonar X3 b mixing problem...

Searched the forums and can't find anything like this. I'm not sure if this is a software problem or a sample problem.
 
I'm in the middle of mixing background vocals of this girl and 5 tracks are OK, but one track is kind of low, even though the meter goes all the way to the top and into the red, and I can't figure out why I can't get it to go any louder. She recorded the vocals in her studio last year and she is not available to talk now. I thought maybe she did something weird that I could fix.
 
The actual wave file looks normal and if I goose up the volume or gain it only then pins the meter and starts to distort the sound.
 
Any ideas as to how I can get this vocal LOUDER whilst not making the meter jump any higher and distort?
 
I really need this vocal part and the only thing that I can think of is to lower every other voice and all the instruments in the song, which I don't want to do.
 
Any help would be appreciated. Thanks.

Thanks. I just double checked and yes, it's going to the correct bus. I did remove the compressor and then goose up the Dry signal in the Breverb and it helps, but the meter is pinned, but, I don't hear distortion, so I guess I should let it be pinned as long as what I hear is ok, I guess.
Now, if I can only find out how to edit the nodes in my lead vocal volume envelope, ha, ha.
 
Should never have upgraded to version B in the middle of a project!

Check for subsonics and supersonics. Set the QuadCurve EQ's high and low pass filters for 96 dB/octave response and cut below 100Hz and above 10kHz...see what happens.

Thanks, everyone. Yes, I have Producer.
 
I don't think I'll update to version E until I finish this project, which is time sensitive. I'll struggle with this for now and work around it somehow. I should have updated before I started.
 
Thanks for the EQ tip, I'll try it out.

I tend to agree with Craig on this one. Cut the stuff that you can't hear, or don't want to hear first, see what it does to your levels. I suspect that her S/N ratio is probably pretty bad, and when you goose up the volume , your pulling up a lot of other stuff too in the form of hiss and unwanted rumbles, as well as some basic audio garbage. Use HP and LP at about 100 hz (maybe even 150) and chop the high end off  at say 10khz (maybe 9khz). See if the audio suffers. Reference point: 110 hz is the low A on your guitar. 10khz is a piercingly high pitch and is used only to provide some air in the signal. Both are safe cuts for female vocals.

Thank you, everyone.
 
I should have not used the word, "Pinned." I just meant that the meter was hitting up where it really shouldn't.
 
The vocals were re-recorded last night by the girl  and sent to me, and all is well. Problem solved.
 
I appreciate all of your advice and I will try the Quad Curve and other tips as an experiment later on when I finish this project (I'm saving the problem project for this).
 
Also, nice to hear from you, Craig Anderton, as I've been reading you since the early 90s and have learned many things from your writing.
 
Again, thanks all.

Yes, thanks, verbs on busses, recording 101, got it. I had only put the Breverb on the actual track temporarily for a few different reason before I added that track to the bus with the rest of the backup vox tracks. It's gone now.