So she gave you a week to decide? Or you asked for a week?
In my experience, both times I signed with an agent, the agent offered and I asked for time to let other agents know. I didn't feel pressured, and it seems strange to me that she'd, in some sense, want to pressure you to make a decision before you had all the information you needed to make a decision you felt comfortable with.
But none of that helps you with your problem, which is that you prospective agent wants a decision when a week is up no matter what. I guess what I would say is that if the deadline bothers you & you feel unduly pressured, consider how that might be a part of your relationship with that agent in the future. You haven't agree to anything yet, and taking a week to think about it doesn't mean you're going to say yes after the week is up, even if this agent is your only offer. If you don't feel comfortable with them, then don't sign.
Best of luck, whatever you decide.