It is undisputed that the cops confiscated the phones without a warrant.
Why would they do that if the cops had nothing to hide?
Isn’t it obvious?
Cops routinely confiscate recording equipment from people taping them because they don't like seeing themselves on youtube swearing and making rude gestures, acting like the Keystone cops or asserting the authority to do things that a look through the statute books would show that they lack. That's very different from trying to hide a criminal homicide.
“It is undisputed that the cops confiscated the phones without a warrant.”
They will claim she voluntarily give it up.
If the police ever ask for your phone and you give it to them, it was voluntarily given. That’s going to be their defense.