Have you asked the breeder what health testing she does to screen for genetic problems in her lines?
Just getting yearly heath checkups done doesn't count as health testing. Ask her if the parents have had bile acids tests done for liver disease, knees xrayed for luxating patellas, thyroid panels and eye exams done.
If you are not familiar with it, study the YTCA's Code of Conduct and Ethics and see if this and any breeder you are considering follows it.
http://www.ytca.org/ethics.html