If it works for you, maybe the reason is her being a custom hireling. After my 3rd PT, I began to use hirelings to have every race (except dragonborn, don't like those) and major class in my party. (9 to 10 member party). So I use customhireling mod and party limits begone mod.
I don't want to use that mod while doing my honour mode run, since a mod corrupted my last HM try (and I was in act 3 then), but I will use that after (maybe when patch 7 and mod support is out.
I don't think, I posted my dwarven sorceress Ada here:
And my new halfling bard Rosina