I get the impression "old-time" could mean a few things. I flicked through a few pages on the internet but didn't find much, only a book which listed the following dances: Old Time Waltz, Veleta, Lilac Waltz, Fylde Waltz, Boston Two Step, Premier Two Step, Rialto Two Step, Gainsborough Glide, Saunter Reve, Britannia Saunter, Balmoral Blues, Lola Tango, Tango Serida, Tango Solair, Camellia Tango, Mayfair Quickstep.
Supposing Louisa had done something like that, I think she should then be disqualified- I feel it would count as experience, and that breaks the rules.
Having said that, I can't see that she would have that type of experience and be allowed onto the show. I'm inclined to agree that "highly skilled" is probably an exaggeration for the benefit of her cv. My list of skills and hobbies on my CV is completely fictional! It doesn't bother me if she has had dance training before, as long as she is new to ballroom and latin.
I would also like to see this page... as I said before, I couldn't find her on Spotlight when I looked.