Rehearsal 3- Finding her voice

We had our first rehearsal doing scene work, not just singing. I am having a lot of trouble finding Squeaky's voice. "Just use your voice," my director said, but I still want to sound like her. I know that most of my tones, and the timber of my voice will work just fine, but I want to at least be able to somewhat mimic her speech patters and match her pronunciation. I guess it will just take time and a lot of listening to recordings. *sigh* I guess I'm just frustrated because I am able to perfectly mimic a few voices so easily and I wish such was the case with Squeaky.