Ok- if it was me, I'd offer to take her out to a NICE (and I stress NICE) dinner with the winnings. If married or involved, take the significant other as well.

If that's impractical, I'd buy her a discount ticket to Vegas (open dates of course) OR a 2-night open-ended stay at her favorite hoteland tell her I need to utilize her luck next time.

Sharing the wealth is classier than tipping someone like a servant.