it sounds heat related to me.. My stomach is always off and I am always tired when its hot out... even if im in air conditioning. Anytime i eat when its hot it feels like lead in my stomach. So that most likely is what it is.
To me it doesnt sound like the sv either just because its been a couple days with no other symptons and then its back. Sounds like she may just be hot and dehydrated maybe. Dehydration makes you sick too..
anyways i dont know if i was much help but i hope she feels better so you dont have to worry too much!
Take care
\"Dance like no one is watching, Love like you will never be hurt, Sing like no one is listening, Live like heaven on earth!\" Mark Twain