street view
Personally, I don't think Lihua is a bad option at all. If anything, she's probably one of the safer choices from Maomao's perspective. But in the Inner Palace, the “sensible” choice isn't always the politically safest one.
The bigger problem is probably politics rather than compatibility. Assigning Maomao to Lihua would still put her directly inside the inner palace, where her connection to Lakan and her unusual background could create problems. The Emperor also has to consider how the other consorts might interpret the appointment.
There is also the question of whether Maomao would even be happy with the arrangement. She tends to value freedom and interesting problems more than status, and being permanently attached to one consort would put more restrictions on her.