Ukrainian Passport

Hello members I like to invite an Ukrainian woman to my country, The Netherlands. She agrees to come. Till now I only had contact with her using this website and Whatsapp. She has no computer with a webcam. So I only received some photos. She now says an International passport costs 4700 hryvnia (174 USD). This seems a lot of money to me. Can someone tell me? I want to pay it for her but I am still not sure about her being sincere. Thanks for your advice.