I agree with you, Juls.
I think you' re absolutely right to let your daughter be present during "manegable" arguments. It´s not good to hide things and let the tension build up. In my family we keep things out in the open, even quite difficult arguments and after we kiss and make up - the latin way. The kids understand arguing is part of life and should not crush us. It´s normal, it´s vital part of life.