Impossible to add my colleague to Zoho Campaign

Impossible to add my colleague to Zoho Campaign

Hi, our company have Zoho One and I'm trying to add a colleague to my company's Zoho Campaign but I have this message "User Marion Ventura is already present in another Campaigns account." 
I need to remove her from this "another Campaigns account", I don't know what it is and I cannot do it myself. Can you do it ?

Thanks in advance,