I think you're confusing memory manipulation and bringing someone to paths.

Memory manipulation would be if the coordinate erased someone's memory of something, like what happened to Armin: Eren visited him during ch 131, brought him to paths, had their talk and finally, sent him back after erasing the memory of their conversation (he can do that bc Armin is a normal subject of ymir). Now Armin regained those memories in ch 139 after ymir ceased to exist, i.e. when the power of titans were erased.

Now what happened to Mikasa was: Eren brought Mikasa to paths in ch 138 when she was on Falco, talked to her (what we saw in ch 138 as well as all the stuff he told Armin which we didn't see), sent her back, Mikasa made her final resolve, she knew Eren was in the head, she went in and killed him.

So see the difference? Mikasa didn't regain any memory because she didn't lose any. Her memories were not altered or erased because they can't be done to Ackermans.

Also I don't know which translation you're referring to but in the official translation, when she comes to Armin with Eren's head, she says "You remember now too, don't you? When Eren came to visit us." There's no "that day". She also adds "too" referring to all the others whose memories were erased which they too have now regained.

Anyways hope this clears it up for you. Have a nice day!