Healthcare providers are only required to provide treatment to stabilize you in a life threatening emergency. Beyond that they can always deny care. And young nulliparous women are often denied for tubals.

A GP would virtually never do a tubal anyway and might prefer that your friend’s OBGYN be the one to handle her birth control counseling and prescription.

Does she have an OBGYN? That’s who she should be talking to, ideally one who is willing to sterilize a nulliparous woman. You can find lists of such providers online. If there aren’t any close by, Nexplanon works for 3 years and actually has a lower failure rate than a tubal. An IUD can work for up to 10 years.