And given her behavior, I get the sense that she was just waiting for the dream to end and for Midori to go back to Tazune.
There prolly was a little of that. Midori is a dreamer, but Maki is a woman with both feet solidly on the ground. The idea that Midori, once their little escapade was over, would cave under social pressure and return to her "husband" Tazune was not at all unreasonable and could not be discarded just like that. It would be understandable for Maki to hold such fears.
Of course, those fears were blasted to smithereens once Midori proposed. By the end of the chapter, we see them making plans for their future together... in particular, how they will deal with Tazune and whether Midori alone or both of them together should go tell him that he has been dumped.
She still loves her, but she has no faith that Midori will stay with her.
Hello? PROPOSAL! All doubts has been cleared by the final pages!
I for one I'm glad Tazune showed up at the station. I didn't like one bit Midori's decision to go meet him all by herself. It looked to me like a direct route to a big domestic violence incident. Thank goodness, now the asshole will have to deal with both of them at the same time. And in a public place, too. Better a hundred times than having Midori face Tazune alone, one against one, in an apartment that belongs to him.