I let her make picks in the Frozen Frenzy contest because she saw her brother doing it and wanted to join. So I just kept track of her picks on the side. She did ok. She had 8 out of 16 games correct.
It might be fun at some point to do something like "are you smarter than a 6 year old" and do a pick 'em where everyone who gets more correct than her wins 100 sats or something to that effect.