I thought I'd update this.
None of the babies from the original 2 litters with bad mommies survived.I think I just waited too long to foster them.
When those 2 females were getting close to ready to pop the next time around, I separated them so each one of the 2 had her own private tub. I figured this was best to reduce any distractions, sources of stress, etc. Both have been doing a fine job of raising their 2nd litter, which are now at the fuzzy stage. One even has a rather large litter, 18 babies! and although they are growing a bit slower, they all look healthy.