When was she a mother to him? I remember her doing some stuff in The Lost Days, but that doesn't automatically make her motherly. Is this an Outlaws thing?
On the other hand, she was so bad to Damian even being nice to someone else would make her a better mother to that person.
Having gone through the series I have comicvine is reasonably accurate. I wouldn't say she was "nice" as her relation with Jason seems to be more student-teacher then motherly.
Then you didn’t base it on ComicVine, but the primary source.