What’s happened to Urszula Radwanska this year?

Question

The promising teen, and younger sister to top 10 player Agnieszka, has gone missing from the court and has now dropped out of the top 100. What’s going on there?

Answer 1

She was last seen in competition losing to eventual champion Serena Williams at the Australian Open before withdrawing from Kuala Lumpur with a back injury last month.