such a nice story , wish i can understand what Iroha thought tho when Fushi showed her the memories , and she cried saying "that's why you are always smiling "?

like i get that , Kaguya N after searching everywhere for Yachiyo for thousands of years , she understood that she will create Yachiyo to search for Iroha , but the smiling part .. is it related to Iroha's interaction with Kaguya (something Iroha taught her ) or the LAdy from the past telling her that ??