some people already said this but i'll say this again anyway.
yes, the mom is bad. but she doesn't mean to be that way. here's the chronological order to make it easier
1. she spoil pryde rotten
2. she got a precog about tyrant pryde
3. let's be honest, even IRL there's plenty of spoiled bitch. and because queeny is already spoiling pryde, it's logical to think that the tyrant pryde comes from too much spoiling.
4. because she, according to novel, 'have too much love', she can't be around pryde, lest she'll go to idiot-mother mode.
i really think she did what she believe is best for all. sure the result is bad, but with the circumstances, not much she could do about it.