Hopefully just a case of going down a set and a break on the back of 13 (or 12 and a bit) matches in less than 3 weeks and thinking her work is done here.
I don't know much about Siskova (or Emilie to be honest, hardly ever seen her play, and absolutely no idea of a potential ceiling), but while a similar age and ranking to Garland, Siskova was a circa 7/2 underdog to win today, so on paper, probably more chance for Emilie tomorrow than would have been originally expected.