Not so good as cover, but good for
concealing the amount of your winnings. Especially good if she says something like, "Honey, can I have another $100 for the slots, hmmm", and rubs against you seductively. While she is distracting everyone with her femininity you pick up $150. You respond, "Sure, babe, here's another hundred", and pass her the $150.
My wife doesn't play Blackjack, but we love this trick. She spots heat for me, too. Another good one is distracting people while asking if she can have your drink. You can palm chips when everyone is looking at her.
Use your ingenuity to think up other ways to distract and either rathole or pass chips. It's fun.
Wally