For the Americans in the audience, she's complaining that she's now over 100 lbs. 45 kb (basically 98 lbs weaklings) is considered the "ideal" weight of a woman in Japan. There isn't allowance for being tall, either, although Fukuda is short even by their standards.
The school lunch was more luxurious than usual so I carelessly ate too much de arimasu.Au~This is bad de arimasu.It's all because of New Year's...As a tank commander... I can't be seen like this...Even if I get hungry or cannot move in the command section...Don't panic, Fukuda!!Commander Nishi-dono!?Even though we have enlisted into Tankery we are still students in our growth period!Don't worry yourself over such increases!!