Only with the right education beforehand.
Lovely for her, I'm sure. However, it would be very nice if she had the choice, like Princess Patricia, to give up her royal status and obligations. It's a rather different thing from being forced to do it. She's living her young life in a fishbowl, meaning that it's hard for her to do normal things and make normal friends, and then when she marries she's chucked out of the royal environment like some sort of factory reject.
Of course it's not the worst thing that could happen to her, but I take issue with "she definitely wouldn't suffer." How on earth do you know?
Aiko will attend ( like all other Imperial Family members) Gakushuin University, it's one of the most academic and prestigious universities in Japan. If she wants to study engineering, then she will. Education is important to Japanese and the Imperial royals, including those who marry 'out'. Sayako has a science degree, she worked as a researcher at the ornithology institute before she married, like all traditional Japanese women she stopped working once she married. Akihito's youngest sister Takako graduated from junior college, she married in 1960 so for that era she was highly educated for a Japanese woman. The younger female princess currently
Princess Akiko is doing a post-graduate degree at Oxford ( her undergraduate degree was from Gakushuin University, her sister also graduated from there) Princess Tsuguko is at Edinburgh university, one sister is at Gakushuin, the other still in high school ( Gakushuin high school!) Knowing that she will marry 'out' Aiko can study what she wants to and can work at that.
Aiko's life isn't that isolated, Sayako in her last birthday interview was asked about making the transition. Sayako said it wasn't that difficult for her as she always knew that she would marry 'out' and become a commoner, it's not something that was sprung on her at as an adult. From childhood her mother prepared her, Sayako spent time with her aunts ( Akihito's sisters) and they were her early mentors. Michiko also made sure Sayako spent time with her family. Naruhito and Masako are going to even more lengths to make sure that Aiko's experiences are similar to other children her age, that's why she was taken to Disneyworld, Ueno zoo, her mother took her on the subway, she has sleepovers with her kindergarten. Aiko attended playgroup before kindergarten, it was a regular one not a 'gakushuin'! Her fishbowl isn't that isolated when compared with European royal children, Aiko doesn't have to be protected from paparazzi, she goes on ski holidays with her parents and there is no press. That's the IHA control of information if you like and lack of paparazzi in Japan. Sayako also worked outside the Imperial Family, Aiko may or may not have that opportunity, but following the pattern of other Imperial females she will at some stage study in a western country. Even Akihito's cousins married women who studied either in the US or UK. The fact that Aiko's parents are so determined to let her experience 'normal' life means that her life is far less isolated than that of her aunt and great aunts who married 'out' without a great deal of angst.
Aiko won't be 'chucked' out of the royal environment, Sayako, and her aunts all continue to have contacts with their family. All of them spend ( or spent) time at the Imperial Palace, once a week was the norm for Akihito's sisters, servants still waited on them, the cooks prepared the meals. If they stayed at the Palace ( one of Akihito's sisters lived in another city and so would stay for a prolonged period of time) servants cleaned their rooms, did their chores etc. Sayako attends ceremonies as a commoner, one of Akihito's sisters is head of some religious organisation ( Shinto) so she has a public role, of her choice.
My 'she won't suffer' is because I took issue with 'a child suffering for an adult cause' so the same can be said there. No I can't know she won't suffer ( although based on what happened with previous princesses, my informed opinion is she won't) but then no-one can equally make the claim that Aiko will suffer.