Question Student Visa and Schengen Travel Over 90 Days

Hello All, My daughter will be doing a study abroad program in Spain for the coming Spring 2019. I'm trying to understand the visa requirements for her stay, especially since it will be longer than 90 days. Does anyone have experience with obtaining a student visa for Spain or any Schengen country for studies longer than 90 days? What was the process like, and are there any tips or things we should be aware of? Also, how does this affect traveling to other Schengen countries during her stay? Any advice or insights would be greatly appreciated!