I think she has got the balance between underdoing and overdoing it about right, although I'm not to keen on what seems to be a standard 'orange' look for professional ballroom/latin dancers (Ola, Lilia, Natalie, and Kristina all look similar in terms of complexion/makeup etc.)
I've found this series of SCD a bit dull, but one of the pluses is that Ola has seemed less shy and reserved than she has in previous series; it's hard to tell her and Lilia apart now.
(and her latin outfits are tame compared to some of the ones I've seen in televised dance competitions)