Well, it depends...
If she's realised what a bunch of creeps the BNP are because she's discovered at first hand the ignorance, paranoia and hatred that drives them, then I hope she's now sitting thinking, 'Why the f*ck did I even think of doing that?'
And, armed with that experience, she can now tell people exactly why a vote for the BNP is a vote for intolerance, division and discord, and that no-one should be taken in by the bland, quasi-wholesome image the party tries to put over in its public offerings.
But if she hasn't seen the heart of darkness within the BNP, or if she willingly embraces it, then I'd imagine that any friendship with normal people would be difficult.