If you need access to her accounts(as long as she has not used windows account encryption) using a Linux (Ubuntu is a popular one) live boot CD allows you to bypass all windows security. You can look at, copy to external hard drive or just about anything else without a trace left on the computer.
If you need an admin account password or just a temporary admin account created use UBCD for Windows
It only partially works for Windows 7 but if the laptop is older this is a good option.
You do need the BIOS on the computer set to boot from a CD/DVD before the hard drive also...