Phone Booth Creepypasta I Made Up

I was on a family road trip, on our way back home we stopped to get something to eat. You know those restaurants that are in the middle of nowhere? Yeah, we ate in one of those. My sister and I are fast eaters, so we finished before everyone and asked if we could play in the field surrounding the restaurant, after some insisting our mom said yes and we went out to play. We played tag for a while when something cought our attention, there was a phone booth. We hadn't seen it the whole time we were playing or when we got there, but instead of questioning it we decided to use it to pretend we were calling each other. My sister went in the phone booth, and as soon as the door closed, the phone booth disappeared into thin air, along with my sister. I ran in circles in panic and then I went and told mom what had happened, all she said was "What are you talking about? You don't have a sister". I couldn't believe mom said this, so I looked on my phone for pictures of my sister, but every picture I remember her being in no longer had her, the only proof I have of her existing is a old family drawing I had made in kindergarden.