Is that insulin you have on prescription from the nhs? If that's the case it wouldn't really be you helping her, but the nhs and (sorry to sound so harsh) that's not what the nhs is for.
Also, I'd be concerned about the viability of insulin posted internationally. I could be wrong, but I think it would probably be frozen in the cargo hold of a plane or at high temperature for a long time on a ship. So, it might not do her much good once it got there.
I'm sorry your friend is struggling. I just wonder if there is a better way to help her. There must be some charities who help diabetics who can't afford insulin, maybe do a bit of googling to see what they suggest. Or do a bit more research about what support is available in her country.