I too (I speak English English) could see myself using "I do not at all like her new husband " if I was emphatically saying that I really really did not like her husband and I would emphasise the 'not at all'.
We don't actually control the "don't/do not" functionality - if we enter "do not", the system is supposed to accept "don't" as well. Obviously, if that's what you put and everything else was identical, it really should have been accepted.
From what I understand "inte alls" is used to express "completely/entirely not". How does one say "not entirely/compeletely"? It's "inte helt" according to Google translate, but I would like to make sure.