They will go at the slowest pace so if you want her to improve dont bother. We did see a small lad getting an absolute rollicking off a female instructor (because he wasnt very good) so keep an eye on her. On the street leading to the hotels, there is a bar owned by a local ski enthusiast. It may be worth popping in and asking him to put you onto someone.
Just got back from Boro , and stayed at Samokov. The kindergarten skiing was minimal for our 6 year old.He did more swimming than skiing !!!! On a plus , he made friends and the girls are friendly and kept the kids occupied .It would be better if you can find an instructor happy to give one on one lessons.We couldn't find one as it was half term.