Dina and Michael Lohan are heading for another showdown over Lindsay‘s rehab. Sources say the Betty Ford Center has upped security to keep dad Michael out at Lindsay’s request during family visit time at the Palm Springs facility. Dina had her own drama trying to get to LA Sunday night when her plane was stuck at JFK because of mechanical problems. Mean while, Michael continues to blame Lindsay’s problems on Dina, branding her “enabling, lying white trash,” in an e-mail to Page Six. Dina couldn’t be reached last night but recently said she was “taking the high road” by refusing to argue.