Petlyuk began 2007 in good form, winning the Sparkassen Cup meet with an indoor best of 1:58.67 minutes and setting a meet record at the PSD Bank Meeting. She won a third straight Ukrainian indoor title and secured the silver medal at the 2007 European Athletics Indoor Championships, finishing second to Oksana Zbrozhek. She was a semi-finalist at the 2007 World Championships in Athletics, but persistent thigh pain dogged her season. After the end of the track and field season doctors diagnosed her with an intervertebral hernia, stemming from her fall in 2006.