I would definitely pursue an MRI, etc if not done already. I would test for blood clots, full panel, etc.
I would say they are symptoms of severe headaches and some types of migraine, but I think you definitely need to do all the tests and rule everything else out before making that conclusion due to the severity. Does she take any different meds, increase in dosage, or otc products, or did she smack her head recently? Many questions have to be answered to rule out the different problems it could be.
I know that I am very sensitive to all medications and I can get terrible headaches and problems from medications. I have eye twitching but I don't know if its a reaction to the medicines that I take or if it's anxiety, etc. I would say you need to walk through the tests with a good neuro and then make a call. I know sometimes they can't tell if there was a stroke if it was small enough and depending on where it occurred. There could be a thyroid imbalance.
The other thing she may want to try, since the triptans are working, is a longer acting triptan like Maxalt or Frovatriptan. Frova is the newest and the longest acting triptan and may provide the best relief. Imitrex is generic, but it is very old and I find it to not be as good as some of the newer triptans. But every person is different so it may or may not work. The other thing that might help is Lyrica. Works very well with nerve pain. The pain could be causing all of her other symptoms, like light-headedness, tiredness, dizziness, nausea because of higher blood pressure, etc. Relieving the pain may help remove some of the symptoms and also assist in proper diagnosis.
Hope this helps. Provide more information as far as symptoms and further background if you want more of an analysis. Really hard to do with the limited information. Anything can cause headaches, smoking, eating bacon, drinking wine, etc.