Client wants to publish my photos to a hair magazine, should I charge a fee?

Im a photographer who recently had a studio session with a client, and her models. She is a hair stylist and we were under agreement for the price she paid to get all images as digital negatives. I was under the impression the images would be used for her portfolio, and personal advertising, but recently I received an e-mail from her with a "Non-Exclusive Photography License" She was asking me to sign the form and mail it back to her, as she is interested in submitting her photographs to a Hairstyle magazine. I guess my question is, since the magazine is royalty free, should I be charging her per image for the publication of my portraits?