There are a few waysWhats the best way to see if her pics are posted elsewhere? I've tried multiple platforms but nothing seems to work and I know she has been reposted.
pimeyes is great for pics where their face is visible. You can see if they exist without paying, but you won't know the sites.
Face check.id used to be good when it was free, really good to keep you from getting catfished though.
Yandex is really good for reverse image searches, just make sure you turn off safe browsing. The similar images can be helpful too.