So, given that, I would be interested if you could tell me what your friend finds out and if there is an easier way to have a baby without NF!
There are basically three options when having a child if you have a genetic condition that can be passed on.

You can conceive the traditional way, and continue the pregnancy as usual, and let what happens happens.

You can conceive the traditional way, and have prenatal testing (CVS or amnio) if there is a genetic test available and then decide whether to continue the pregnancy if the baby is found to carry the condition.

You can conceive through IVF and have PGD (Pre-implantation Genetic Diagnosis) and implant the embryos that do not carry the condition. The egg and sperm are combined in the lab and grown to 8 cell stage. One cell is removed and tested for the condition.

None of these options are easy, and each has its own pros and cons. If you want more info, a genetics service can explain the options particular to your case.