Her Ipad can have parent controls introduced to it to stop certain websites being accessed, worth checking out the school policy and add all those websites not allowed to a blocked list, that way there can be no shades of grey, your daughter cannot access anything outside of the rulebook.
Then if she does want to access other websites, she can have full access to the internet on her phone, to be used in her personal time!!
That way forward would probably create peace of mind all around!!
