Does a little Judo help or confuse kids learning BJJ ?

I've had a little look in the forum and I haven't seen a similar question ! My daughter has been doing BJJ for about a year now ( just turned 8 ) and she absolutely loves it , She goes to BJJ twice a week ( there is two kids classes a week ) She has recently taken part in a competition and It looks like competing in comps is something she REALLY wants to do ! I was wondering would going to a Judo class ONCE a week benefit it her for the standup or would doing the both just confuse her ?