Elizabeth is sassy and straight to the point. She is also caring even if she doesn't show it as much as the other two. She is also the strongest of the group and most skilled. being the most prone to throw a move out first and get feisty at times. I imagine her voice is deeper then the other females voices and more deep yet still feminine in a way.
References (these are not meant to be exactly how you should do the voice but voices I feel can fit the character either it be there tone or energy)
Laura croft, tomb raider https://www.youtube.com/watch?v=AIO5cY5cpbs
Ripley, alien https://www.youtube.com/watch?v=YsJxdoOKixM