The title's false anyway, she got turned on when Shoukaku had her diapers off.
As to her mental state, baby-like doesn't seem accurate. Closer to a semi-conscious state, where she isn't thinking at all clearly, including managing bodily functions.
Went in expecting some fetish, came out with heavy feelings. This is pretty heart wrenching especially when you can't control your body the way you want it during recuperation but the extras lifted my spirits.
Uh that title needs to go. The manga was better than expected tbh. And there wasn't any diaper fetishes going on at all (which i thought was going to be the main focus).