Hi , I am so Sorry about your daughter haveing very bad headaches. I used to get them very bad too when I was in my early twintys, I am 29 now with two kids of my own. I do not get them anymore ,I am not sure if this will help her but I went all natural in my home and of corse with the food I eat. Sometime the things people clean with can really bring on headaches and nausea do to it being very toxic.
What time does she get them and try to see what she is aroud at that time . Like I said I do not know if that will help her,but I found that to be the sorce of mine. Here is the website if you want to see what Health problems can be help just by going GREEN, www.livetotalwellness.com/healthyhouse .I hope I helped you out a little, I hope she start to feel better soon. A.