If the cancer was that size it's borderline 1a2/1b1, as mine was. If she had a LEEP, that's less extensive than the cone biopsy I had (did she have it under general anaesthetic?) so she does need some more of the cervix removed, the question is how much. They will ideally want a clear margin of non-cancerous tissue so are likely to take most of her cervix, which will almost certainly impact on future pregnancies. But they don't have to take the entire cervix, and the lymph nodes are optional too. Yes, radical trach. is now proven effective treatment for this size of cancer, so they're going to encourage her to have the standard procedure (at least trach. is more common now, a few years ago I had to push to even discuss it). But it's up to her - if she wants to preserve as much of her cervix as possible that's her choice.
I googled for a Mr Crawford in the gyn-onc field - is he in Cambridge? I was in London and saw doctors at UCH and Barts. I was 30 when I had the cancer, by the way.
I decided not to have further treatment as in my case it was more likely than not that it would be unnecessary as they thought they'd got all the cells, although there was no certainty. It was a very hard, lonely decision making process - just about everyone I knew thought I was being irresponsible but I felt that it was the right decision. If it had turned out not to be, I would have had the full weight of my choice on my shoulders. Fortunately my DH was very supportive.
Yes I was very concerned about the effect on my cervix in my subsequent pregnancy. I started having scans for potential 'incompetent cervix' but discontinued those and spent an anxious few months wondering if my baby was going to be very premature. It turned out fine, I gave birth at term, a 2 hour textbook home water birth. If your friend is less bothered about the mode of birth than I was, she'll presumably be more accepting of the necessary c/s if she does have the trach.
Lymph nodes - there's something called sentinel node biopsy, where they can track which nodes the cancer would go to first and only remove those - I believe this is still in the experimental stages for cervical cancer though. If she has MRI scans they would only show if the nodes were swollen with cancer, not if there were just a few cancerous cells there so a clear MRI is not definitive proof that the nodes are clear. I reasoned on the balance of probabilities that I was ok, and I was, but it's a desperately hard decision to make. There are risks whatever she does, the risk of unnecessary treatment that permanently damages her shouldn't be underestimated, but most people on hearing the C word don't want to take any chances.
Best of luck to her. And well done you for being such a supportive friend. She needs non judgmental support, whatever she decides to do.