I think by next week Deb may end up being sympathetic to Dexter and will start to try and help him. I just can't imagine them fighting against each other. As Deb says repeatedly, Dexter is "all she has."
I don't see her helping him out, at least not yet. The impression I got from this episode is she's just going to decide to "look the other way" while he does his thing for awhile.