Her intelligence boost will mainly be just from all her past experiences coming together, so perhaps it's more accurate to say she ends up more wise from experience but not more intelligent on things she never knew about. Her mind is, however, much quicker, thus accounting for her calculations of how the world is different and can adjust and react super quickly. Putting all of this together it may seem like she's all regal and intelligent like a wise old hermit at first glance, but deep down she will be the same old Evvie but with proper grammar and an understanding of the use of clothing.