Hi Jen,
Another option that I used was Re-Gen oil, there's also a cream. It does the same as Bio oil but is a bit cheaper. I got mine from Asda.
Hi hope your friend is doing well,m yes try Bio Oil (Primark sell it cheaper than other places) I used for both my surgeries after mastectomy, and the scarr is pretty much gone now, it has taken just over a year, but worth persevering with... good luck xx