I'd recommend your daughter tries the contraceptive method called Persona (available from Boots) but uses it for the opposite of its intended purpose.
It is much cheaper to use than ovulation tests and only requires the user to pee on a test stick every morning. No charts, pills etc. The machine learns your cycle and can indicate when ovulation is occurring via a little indicator. This has worked for a number of people that I know, some of whom had medical intervention, had been trying for years, and suffered a lot of heartache.
Its worth a try. Use the red days as the indicator of the fertile time. Don't bother during the green days. Celebrate if it learns to spot ovulation.
All the medical tests, and pressure to do things at exactly the right time make the whole process of conception very difficult, especially if your daughter feels pressured by the amount of time she has spent trying to conceive.