I would DEFINITELY have her contact IO. If she doesn't know her member number they can look it up with just her maiden name. They will be able to help more than anything. Tell her good luck!
ZLAM!
I had another idea. Is the chapter a deactivated one? Maybe there is a local Alumnae group either in your area, or in the area of the collegiate chapter that might be able to help with contacting the chapter. Just a thought.