Try
Exceptional Voice, especially CD 2, which concentrates on feminine resonance. They've explained more of the "how do
I learn to do this" in these two CDs than the other 'methods' I've bought.
They also offer a block of six weekly coaching sessions for $630. The course is structured around three blocks, with 2 to 3 months off in between the blocks to give you time to practice and assimilate the lessons from the previous block before progressing to the next. Kathe Perez also said that she will individualize her coaching with each student -- in other words, if your fundamental pitch and resonance are good, shell accelerate to articulation/prosody/etc., whatever you need the most work on.
When I get my finances in order, I plan on taking at least a block of personal coaching.
Drop them an e-mail. If you give them a phone number, Kathe will call and answer your questions.
Karen