Mary was, according to Scripture, the chosen instrument through which the Savior would take on humanity for our sakes, and willingly consented to take that role. And she, with all the saints, is alive in Christ and in the Heavenly places which He has prepared for us.
Whether or not she was perpetually virgin is totally irrelevant to her having willingly taken that role in God's plan.
She deserves our respect, whether or not we believe any particular thing about her.
Oh, and the title of "God-Bearer" (Theotokos) is something she is entitled to, not in and of herself, but because it was the chosen way to stress the trueness of the Nicene faith against the Nestorian heresy. And that's important -- how many times have you heard someone talk about "God" and "Jesus Christ" as though they were two completely distinct things? That's not Christianity -- it's at best Arianism or Nestorianism.