juicy0 - I get migraines and here's what I've learnt.
Sumatriptan is an OK med for when you have a migraine. There are different doses. I found the larger dose was too much, and that if I took a smaller dose I got fewer side effects but it still fixed the migraine.
I switched to Rizatriptan a couple of years ago - much fewer side effects, just as effective. It's a melt on your tongue tablet rather than one you swallow.
I usually get 3-day migraines. I take a triptan on day 1, then on day 2, then on day 3. On day 4 I'm usually OK. Sometimes I have to take two in one day, but very rarely.
Sometimes I take an anti-nausea tablet such as Stugeron too.
There are lots of preventatives to try. Anti-depressant (low dose), anti-psychotic, and blood pressure meds. I believe you can also try beta blockers. None of these helped me unfortunately.
More info here www.webmd.com/migraines-headaches/preventive-migraine-medicine#1
If you fail all of those you can have Botox injections - these are very effective for some people including my DD's 16 year old friend.
I am in the US and I have Aimovig, which is a monthly injection you give yourself - very new. The NHS has decided not to fund it yet, but there are more new options coming.
It's good to keep a diary of when the migraines happen, what meds you take, and if possible anything that might have been a trigger.
We had a huge storm here last night - the barometric pressure plunged very fast. I woke up at 4am with an appalling migraine.
I also no longer drink wine, as it very quickly sets me off.
Many smells set me off. I struggle with candles, scents, perfumes. Oddly I'm mostly OK with cigarette smoke.
Certain types of heating also set me off eg I have a fan heater and an oil-filled radiator for my home office, but I've had to stop using them because they trigger migraines. My woodburner can do occasionally.
I wear glasses that filter blue light.
Just throwing a lot of info at you in case any of it helps. It sounds like your DD has a GP who wants to help. It can help to be referred to a neurologist (I think for Botox that's required).
My GP also said that being on the Depo shot may well be helping my migraines as it keeps my hormones on a more even keel. Again, very personal.
I hope she is doing better soon. It must be hard to cope with constant headaches, and so unfair when she's starting her new life.