Should I call her back?

Here's the situation, my father and I have been fighting for the past few days about a very trivial subject, but as trivial as it may have been it was the primary occupation of my time for the past couple of days. That being said, I haven't talked with my girlfriend for the past couple of days including our 1 month anniversary day.

Today I get a call from her concerned mother making sure everything is alright with me, I tell her that it's just been a rough couple of days and I haven't meant to neglect Arleen in anyway. She then tells me her wonderful step father has convinced her that I've been cheating on her, for what reason this very sad and pathetic man would intentionally attempt to destroy our relationship and ultimately demeen his step daughter I truly do not know.

I talked with her today, earlier and she sounded pretty broken up, I told her what happend and it seems pretty obvious that she's being swayed by her step father at this point, I told her to call me back when she's ready to talk and that was about 6 hours ago, so should I call her back and what should or could I say to better the situation?