website compromised

Site URL: https://one-of-a-kind-jofi02.squarespace.com/

Hi all, a client of mine has received this message from Google:

 

Google Ads Disapproval- Compromised Site Scan Results

Also see attached screenshot.

I have no idea what it all means or how I can help her. Does anyone have insight into this sort of thing and can help me make head or tail of it?

thanks!