I just hated Petko for years (only because she beat Olaru in that final) but she is sooooo nice and all-round cool person that I ended up liking her very much
I'm happy for her that she overcame those injuries and now made this SF, but she will be huge underdog. She does have moments where she's just "in the zone" and there's not much you can do to stop her. She'll need to be like that the whole match, otherwise Simona will impose her game. The way Simona played this RG i don't see her losing to Petko.