What is the easiest method to check if I have DDR3 memory?

I think the easiest way would be to ask her for the model of the computer, either from a sticker somewhere on the computer or by clicking start > right click computer > select properties (that's how I did it in the attached photo). Google the manufactures name and processor type (and model number if you have it).

Manufacturer and Processor number should be enough. (for example I did mine: Lenovo B940 google came back with the information in the first hit.)

press +r

On the dialogue box, type ''dxdiag'' And then press enter.

Your directx UI will open.

Click ok ''save all information'' and save it as a text file on desktop or anywhere u want. This text file is the encyclopedia for your hardware information.

Search for the ''memory'' title in the text file and you'll see what you want

Well if it weren't for the downloading and installing bit, I'd say use Speccy by piriform(the people who make CCleaner), as it has a handy function to post the system specification snapshot with a semi private url.