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Should you? I don't know, you should be able to answer that on your own. As per RAM quantity, go with 4GB.
 
Adding the extra RAM is the best decision you can do. As long as the ram doesn't cost too much, then I would say go for it. Not having enough RAM is pain especially when you have several programs running.
 
If you have to ask, you don't deserve to boost her RAM. Move out of the way and I'll show how it's done. 😉😛😀😀😀
 
Using a current version of OSX on 1gb is a pain for doing almost anything. I agree that you should upgrade it. 4gb should be plenty.
 
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