If I am not wrong Rybanská competed for Slovakia´s seniors NT ? or at least I think that I heard it somewhere, but I can be wrong obviously.
However, I am perfectly fine that she play for , she is of hungarian minority and playing for Slovakia would be so cruel and unfair for her considering her quality and talent. She would never win anything with Slovakia, while she always fights for medals with Hungary. Just like Štefan (István) Gergely was among men, mainly he was the guy who qualified Slovakia for Sydney 2000 and despite his fantastic efforts as goalkeeper he could not help us to finish higher than last 12th there, when he moved to Hungary he won the next 2 golds in Athens & Beijing
So, personally in team sports I do not see it as something terrible if a player which has some high standard level to kill his/her career playing for his origin country which is piss poor in that sport and instead let him/her move to another country much more stronger in that sport + if he/she has roots and origin in the other country it is rather necessary and obligatory to let such athlete move and have chances to fully express his/her talent