My advice QS is to watch the video WITH them... don't just hand it to them.
Don't worry about the co-workers... After exposure happens there is always a rush to find people on "your side" to to speak... If the best she can do is a co-worker and her family and mutual friends with you all refuse to accept her behaviour then she's going to be under a LOT of pressure...
Don't just give them the video, watch it with them... even if you've seen it, watch it with them... They want to see YOU are watching it too... And you will have a chance to talk with them immediatley AFTER watching it while the impact is on them at its heaviest.
