DD is 10. EPCOT has been her favorite park other than MK since she was 2. It is a 2 day park for us. If you only gave her one evening in EPCOT, after she quit crying, she would definitely say she was not wasting that time on Illuminations. Her focus for that short a time would be the Agent P missions throughout WS (although they are more crowded at night), and rides. Be aware though, that some of the rides in Future World close at 7:00 p.m. - I don't know if this has changed in the last few months, but when we were there last October we spent our arrival evening in Future World (everyone else was as Food and Wine- so WS was packed and FW was great) and I know Figment, Nemo, and Living with the Land closed at 7 that night. Test Track, Soarin, and Mission Space stay open until closing for sure. Also, Illuminations often starts right at park close so theoretically you could find a spot as it was starting to stay and watch. The ride lines will close right at closing time. I can recall one night we were in line for Soarin a few minutes before park close, and then we came out and found a spot and stopped to watch the end of Illuminations.