A correspondent is quite right to point out that in liturgical Latin the Abl/dat of anima is (always??) animabus and not animis. Put the slip down to my so many decades of teaching Classical Latin, where, I suspect, only filia and dea operate (for obvious reasons) in this way.
Thinking about it, I recall also famulabus in liturgical Latin. What other examples are there?
I wonder if animabus goes back far enough to count as another example of Christine Mohrmann's point about the deliberate archaism of liturgical Latin. Or whether it's simply to distinguish anima from animus.