I was a bit surprised I didn't see more people bring up Siri cause it felt to me she was being propped up as one of the possible culprits of the blackmail. The fact we get a shot of her holding her phone and shooting a look at Ashe as she's heading to the locker room. Then almost immediately entering the locker room after Ashe sent the pictures acting kind of weird like she knows something. It felt like she was relishing in the fact that she was messing with Ashe and getting away with it. Could just be flirting but idk.I haven't seen anybody mention yet that the same "looking at her phone at the right moment" red herring wasn't only used for Delilah, but for the gym lady, too. My theory is that gym lady does creepy stuff at her gym and Natasha will come to Ashe's rescue and shut the gym down to show character growth and that beneath the predator vibes she's a good gal actually, who hates duplocists.
We know thanks to Rape Cop that Siri has Ashe's phone number but maybe Ashe doesn't know her number, also it did seem weird to me that she apparently told Rape Cop that Ashe was looking for her as if she misunderstood Ashe's obvious intent when asking about her. It just felt like Siri was being low-key antagonistic to Ashe in some ways.
With all that said I still think Delilah is the biggest suspect with Siri possibly being prime suspect number two. I don't think Rape Cop is going to come to Ashe's rescue though... at least not intentionally.