As I have said before, I am not a fan of three name combos. However, I do really love the name
Louisa. I think it is underused and has a lot of elegance. It can also be shortened
Lou (so, if that bothers you, take that into account). If I had to choose from your combos I suppose I would go with:
Louisa Millicent JaneLouisa Beatrix AnneLouisa Beatrice Jane