That could be an idea, altough I don't think she'll be able to pinpoint it with great detail. She is limited to what the cards will show her and while she uses her clairvoyance to get more accurate results it is dangerous to rely on them. The future is a lot like water and can't really be pinned down. Also she isn't yet able to gaze into the past or future using her clairvoyance, which is why she continues to use her cards. It's iffy but we can always give it a shot, it's better than knowing nothing.