It sounds like you submitted the claim to Lyft after you returned the phone to the pax, for which she decided to lie.
Always submit the claim the Lyft before returning items to the pax. Then, only after Lyft sends you a follow-up email acknowledging they’ve made contact with the rider. This is for liability reasons in case the pax say they never received their item back, even though they did, and also so everything is documented.
Lyft doesn’t ask for pics, so taking pics for Lyft is pointless. However, still take pics for your liability in case the pax tries to say you cracked the screen of their already damaged phone. 7/10 pax that kid in my ride I’ll have something messed up with their phone more specifically the screen. LOL