Victoria, I will PM you..I have done exhaustive research on this in my own search for a female voice , which was finally successful..it's a process.
It may help you to understand the mechanics of where and how vocal sounds are shaped..this understanding helped me to apply some of the specific "how to " advice from various sources, and to learn to reject some as BS and some as not helpful for me personally. by the way, if you are a trained singer, this process is easier. Here is something to get you started:
http://www.vocalist.org.uk/headorchest.html
The link is about the "elevator theory" of singing. One of the tricks people learn to increase their vocal range is the "siren exercise" , where you learn to go from your lowest chest voice to highest "head voice" (not falsetto) up in your sinus cavity, without your voice breaking. This was a breakthrough for me. When you find the female voice that's really convincing (always ma'amed on the phone, if they couldn't see you they still hear a female), the sound is shaped up in your sinus cavity and all the bones in your forehead are resonating. I imagine( the image I use) that the sound is forming out in front of the bridge of my nose or eyes...but all the the airways are as open as possible (think round tones), and your vocal support still comes from the chest and diaphragm as in any singing, which is how it has resonance and not the "cartoon character" sound. The pitch almost takes care of itself when you learn this (it will automatically be higher because of shaping the sound up in your sinus cavity.) Tone and resonance are a much bigger deal than pitch in having a voice that sounds truly female.
I'm PM you with some resources. Don't get frustrated..at first all I could produce was air!!