A new term I am going to have to start using

Sanctimommy - Definition: a mother who points out perceived faults in the parenting of others

Note: And for a perfect example of a Sanctimommy check out this blog. And just so you'll know, here we typically call this kind of mother a foster parent or a parent basher or a self-righteous hypocrite.

Perhaps we could get it listed in the DSM-V? Ask your shrink for instructions on how to submit for inclusion.