Hi Lisatay25, please tell your friend not to despair. I was told by my GP I wasn't ovulating after the Day 21 test and I felt devastated. I was subsequently referred to an Assisted Conception Unit who established that I do ovulate. I just have a longer cycle/ovulate slightly later in the cycle, which meant the Day 21 test was done on the wrong day.
As I understand it, if your friend has periods she is most probably ovulating.
If she wants to do something practical while she waits to see a specialist, she could try doing an ovulation predictor kit every other day for a month to see what happens (I say every other day because the kit is expensive: if she's not worried about money she could do it every day). It may also help if she records the start dates of her periods (if she hasn't already been doing so) so that she can calculate her average cycle length.
Hope this helps - I was really angry that my GP's ignorance had caused me unnecessary upset. I'm still trying to conceive after 3.5 years, two rounds of IUI and one round of IVF, so I'm afraid I can't give you a happy outcome (yet), but there could be all sorts of reasons that your friend isn't pregnant yet, that have nothing to do with whether or not she's ovulating. The sooner she gets to see a specialist, the better.
It's great that you're supporting her and finding out what you can.