Так всё и было успешно до тех пор,

Так всё и было успешно до тех пор, пока мама не побывала в гостях у бабушки и не вспомнила в разговоре с ней о моём неожиданном визите.

Результаты (английский) 1:

So everything was successfully until mom went to visit Grandma and not recalled in a conversation with her about my unexpected visit.

Результаты (английский) 2:

So all was well as long as the mother has not visited a party with my grandmother, and she remembered talking to her about my unexpected visit.

Результаты (английский) 3:

the way it was successful until the mother was visiting grandma don't remember the conversation with her about my unexpected visit.