I don't know anything about Moose Cree specifically, but when it comes to dental/alveolar nasals, laterals, and rhotics, both assimilation and dissimilation are very common processes. In Korean, for instance, /l/ can surface as , [ɾ], [l], or [n] depending on what it appears next to. So unless there's a strong reason to believe otherwise, I would simply chalk this up to progressive assimilation of *n to the preceding /l/.
"Richmond is a real scholar; Owen just learns languages because he can't bear not to know what other people are saying."--Margaret Lattimore on her two sons