Even if she remains as a child there’s no chance in hell that she will end up with mitsuhiko that’s just not possible she sees them as child’s and from the beginning she maintained her maturity even more Thn Conan.and she likes Conan so yeah mitsuhiko is just out of the picture so there’s two Possibilities possibilitiesfor her when conans identity is revealed Thn most probably kugaro will learn that all these years conan was helping him and forcefully making him sleeping kugaro and he won’t support ran and shinchi anymore though I doubt it will happen. But the second scenario is most likely happen that with the war with BO she will die and tell shinchi how she feels about him and shinchi will get more angry and fight the BO so yeah that’s the two Scenarios scenariosI can see end up happening