She's quite thin IMO. Do you know how old she is?

Maybe if you answer some questions we can help you to get her eating well for you:

What are you housing her in? Enclosure etc, what are the temps, and how are you measuring them?
How often do you handle her/how often have you handled her in the week you've had her?
How often have you tried feeding her in the week you've had her? How did you try to feed/offer the f/t and live to her?
When was she last fed with the breeder/previous owner? Do they know an exact date besides "awhile ago"?