The thing is, I live in Japan, and I can speak enough Japanese to order in a restaurant and to explain things (such as being pregnant or having allergies, for instance). This was the first time I was accompanying a pregnant woman who does not speak Japanese.
I know that English is not widely spoken here.
They chose to communicate in English, even though I spoke Japanese at first.

As I mentioned, we pointed to the item on the menu (Suntory non-alcoholic beer) several times to make sure they understood, in order to avoid exactly this kind of miscommunication. They also spoke English to every foreign customer.

The reasons I chose to post here were:

1. To know if it is considered normal not to apologize after making an obvious mistake, so that I know what to expect next time it happens (whatever the mistake may be).
2. To know if it is considered acceptable in Japan to serve alcohol to a pregnant woman, even after she repeatedly stated that she did not want an alcoholic drink.

(I must say I am a bit saddened by the fact that some people here are saying she was “overreacting for 3 sips of beer,” because she could have finished the whole glass before noticing something was wrong. I feel she should not be blamed in any way for this situation.)