Well don't give her the wine beforehand she'll need her wits about her 
I only ever use it twice a year so have had no problems with breakage or anything. It doesn't straighten your hair, just takes all the frizz and volume out if it. It usually takes me at least an hour to wash, dry & straighten my hair but when I've used this treatment it takes less than half that.
Make sure to use salt free shampoo afterwards. Hope it turns out well for you.