Hmmm from the looks of it, it seems it's a number that uses a paid/free service to mask its true identity. Do you get spam messages from this number aside from the usual texts? Let's wait for the seasoned members here to take a look at your issue as well. I'm sure they can give you the answer you've been looking for
There are a couple possible solutions to this problem. If it is a restaurant or store promo, have her try texting STOP to the number. That should unsubscribe from most of those services. Otherwise, there is a great number blocking tool in MyVerizon under my plan and services that allows you to block up to 5 numbers. I hope this helps!
Unfortunately, the five free blocks will not work on short codes which this is one.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.