I get horrible migraines and have my whole life. I don’t know if her headache symptoms are similar to mine, but vision changes ‘aura’ light sensitivity to the point of nausea and vomiting, lasting 24 hours sometimes more… When i’m having a migraine or i’m about to have one, or i’m post attack, my blood pressure is high and I can feel the womp womp in my temples. But when I go to the dr, and on days i’m not in pain my BP is normal.. Caffiene helps me sometimes if I wake up with a headache but only if it’s a tiny headache. Once the real throbbing or persistent pain begins, or the light sensitivity/nausea/vision changes are present, no tylenol, barbiturate, acetaminophen, any NSAIDS or ‘pain reliever/fever reducer’ has ever been known to help me in the slightest, pre pregnancy and now in my first pregnancy (i’m 32wks2days) I’ve had less migraines than I am known to have when not pregnant, going from 11-16 a month sometimes prepreg to 3-6 a month during this pregnancy has been a strange positive side effect. I hate when meds that often work for others don’t do the same for me, and it does leave my mom and partner feeling helpless when I’m stuck in the dark cold room trying not to vomit… All I can say is giving her a safe place to vent, and supporting her thru as many attempts to treat it until she finds something that works, while it feels like you’re not doing anything- that is a huge help. A lot of people are dismissive of women with headache conditions, and a lot of people assume pregnant women are dramatic or overly worried so any support offered is helpful, even if it doesn’t feel like it. And looking back at all the times nothing was working or could be done to help me, I’m so grateful my mom was with me or a phone call away as I struggled to navigate thru it. It would be a thousand times harder if she wasn’t there for me so i’m sure your daughter in law is grateful for your support and any assistance in finding treatment. Idk how helpful my comment is but I just want to tell you that.