By twice daily do you mean maximum time sessions? How long were the sessions, also how much does she weigh?I have a Sperti-D lamp. My wife's doctor had her on these 50K vitamin d scripts, when she got tested a few weeks later, her storage levels were only up a tiny bit. I convinced her to stop them and use the lamp twice daily and then get tested a few weeks later. Surprisingly, her levels went from 'deficient' range to 'sufficient' range. I don't have the exact numbers at hand, but it was about 10 points from what it was. So, I believe the lamps do what they say, and I am of the camp that oral D has its problems. I believe that vitamin/hormone D is complex and that these storage level tests do not tell the whole story.
Was she taking 50k a day or week?