Sorry, up to this time, she still remains as "the beautiful blonde girl" in Winger's Headed for a Heartbreak video.
She looks a lot like the Rebecca De Mornay back in the day. The blonde hair and the bangs quite made an impression that it could be her. Unfortunately, there has been no source linking De Mornay to that Winger video.
Searching via Google, the only thing you can come up with is a link saying that her name is Sandy.
You may want to try your luck by contacting the band via their official Twitter and Facebook accounts.
For the latest winger news, updates, tour dates, album releases and more, just log on to www.wingertheband.com.