People with Multiple Sclerosis! What should my step-sis take?

Ok my step-sis had multiple sclerosis for 4 months now, like a week and a half ago she finds out she is allergic to Avonex, does this means she is allergic to other interferon-betas.
She cant take any of those once a month IV drugs because she travels and sometimes overseas
which would be right for her? copaxone or ldn
what do you think? she is goin to the neuro soon and need opinions?