I suffer from chronic back pain and have gone through the ringer when it comes to medication and a multitude of surgeries. Gabapentin does not work for severe pain period. They had me on 16 tablets a day, sorry can’t remember the strength, for over six months to no avail. I sincerely feel badly for her. If she wants to try them, see how many pills they prescribed her in total, divide by 28 which will give you the total/day then divide by 4 (4 being the amount of times she takes it each day.