That was pretty much why I suggested calling CPS rather than dad--it would have been anonymous so she couldn't put the blame on you (and dad would have found out as a result of the CPS investigation). Water under the bridge now, though.
You did the right thing, and for the right reasons. She may never forgive you, so maybe you just have to accept that the relationship with her is over. If she eventually gets out of this train-wreck of a relationship she might understand. But for right now you took a step to protect the kids, and you can take comfort in that.