I agree that Louisa to Kawnipi would be hard to do in one day - I've done it twice and used two days both times.  Agnes to Kawnipi is faster. 

Be aware that the East end of Kawnipi is all burned over from the Bird Lake fire, and campsites are few and far between.  If you did go via Louisa and Glacier, I'd plan on camping on McEwen or Kenny lake.  There is one site on the north side of the narrows in Kawnipi after the falls - after that, you have to make it close to McKenzie Bay before you get many choices for campsites.