Honestly, I feel your pain. I went through the exact same nightmare with my aunt for like two years before I finally gave up on the official Walmart app for shared lists. In my experience, they keep changing their UI and those old 'shared list' features are basically ghosts now. I tried everything, even sitting there copying her frantic text messages into the search bar, but it is just a recipe for missing the eggs every single time. Over the years, I've tried many different workarounds, but honestly the native app just isnt built for collaborative shopping across different accounts. It is super frustrating when you just want to help family out without the extra headache. Nowadays, I just use a third-party tool because it saves my sanity.

• Stop relying on the Walmart app to sync accounts, it wont happen.
• Just a heads up, Easy Cart Share is really helpful for sending specific Walmart lists to family members.
• Have her make the list there and just grab it when you are ready to check out. It makes my Friday grocery run so much faster since I am not hunting through old messages while standing in my kitchen. You just send her the link once, she updates it, and you are good to go. Trust me, it is way better than trying to force the Walmart app to do something it clearly doesnt want to do.