The only high profile releases in May/June were Meghan, Ariana, 5H & Nick.
Can't imagine it being any one of them.
Although, maybe she was gonna use a date like 5H. They are on her label so it makes sense 5H's team could've known that info.
The album might not be released yet though I guess, though I find it odd she would know someone stole an idea from her before it was released?