I'm the one who did the research on Wolf Cousins and here is further backup to why I think she's working with, Max Martin camp/Wolf Cousins all week
So you know how tove posted the pic on her IG and tagged wolf cousins.. I thought that sounded odd so i searched the hashtag as well as googled it and it's actually a songwriting team created by Max Martin and Shellback BUT they are also apart of it as top producers.
This woman Minna Fagerstedt is an A&R rep for Warner also associated with Wolf Cousins and
she posted an ig of Hil with Tove Lo and someone else
http://instagram.com/p/ynK08ysRU1/?modal=true I translated the caption and it read this A long-awaited Hilary ran her first day in the studio with these wonderful two today Looking forward to an exciting week! #hilaryduff #tovelo
if you look at her IG followers she's following EVERYONE from Wolf Cousins camp and notice she says "looking forward to a wonderful week"
Also Tove Love on Wolf Cousins from Billboard
Have you worked with Martin before?
I'm part of his songwriting team – a group that him and Shellback have signed called Wolf Cousins. It's six different producers and me as the top-line writer. So maybe Martin and Shellback will write a song and produce it
together with one of these new young writers, which obviously gives us a huge chance to be on a bigger project that we would never get a chance to
be on otherwise. And it's also kind of like mentoring: We're all sitting together in this big studio complex in Stockholm, which is awesome, and they're just working their asses off. That's pretty recent – it just started end of last year.
Also Love me like you do by Ellie G 2 of the writers and producers are from Wolf Cousins and Wolf Cousins is credited!
... 
I didn't know the show was gonna be that sexual. Now I'm even more excited. 
I'm alive again 
