No, she didn't steal it. That site is a compendium of worksheets that teachers can pay a subscription into to have access to worksheets -- that other teachers and curriculum organizations -- have submitted. Some are made by teachers themselves; some are submitted by organizations. There is a problem with relying too heavily on premade material (although I've used other teachers' material that isn't copyrighted myself -- if anything for ideas for teaching an assignment; just like I had to submit my own work to compendiums myself -- yes, had to: when I worked for a private education company that was part of the contract -- any material I made was owned by them). A lot of the younger teachers are told about this -- you don't have to make your own material, just check the copyright laws to make sure you aren't breaking those -- so they don't even look into what they are printing out...if it's on the website, then it must be ok (kinda like how people take in their news).