Except the difference is that the first mother was indeed a fine caring mother that had shithead tendencies towards all other beings like classic Deibu but this one is plain useless and doesn't even care for its children despite what it said.
She learned to be a Yukkuri mother. In other words, the completely useless one who doesn't do any of the work and only gets the "easy" part of raising the kids.
The truth is that Yukkuri Mother is actually a useful and active duty, the thing is, well, this is a deibu, they won't even do parenting well.
A proper yukkuri mother is one that actively take care of the kids instead of "stop doign that and let me sleep buggers!" or "ok eat whatever you want".
It's like those yukkuris that act like nannies or teachers, they have a more active role taking care of the kids, but since this reimu is a deibu, you can see that she clearly don't have the same idea of "Parental Activities" than a proper Yukkuri Mother or Yukkuri Father.