Can I use the graphics of a theme to create other visuals support (example : business card)

So my client bought a Theme for her website (Regular License).
I’m requested to make a facebook banner and a business card for her brand.
She would like me to use some of the visuels of the theme.
I would like to know if I’m allowed to use the graphics of the theme to create her business card and facebook banner?

You 'd need to be very careful about where they came from.

Typically authors are not supposed to redistribute assets in the theme download because they often use stock which they would not be licensed to then share

Your better option would be to contact the theme author and find out where they got the asset form and get your own copies