Sorry for the late replies, been busy.
She doesn't do any rendering, mostly just excels.
I'm hesitant to get an SSD because I bought a crucial SSD 2 years ago and it failed recently so I'm kind of wary...would it help just to put in a 7200 RPM 2.5" HDD? But 100$ for a 240gb crucial SSD is pretty legit, I paid almost 3 times that for mine.
And as someone stated earlier, it is a non retina, so probably not worth upgrading because no matter how much 'faster' we make it, all someone with a retina MacBook has to say is "Oh, well I got the Retina."