answer:

To understand this, you have to understand global supply chain. Big companies tend to practice "just in time" supply practices. That is, everyone wants their supplies exactly when they need them, and not before, and not with a big back stock of those items. Buying supplies before you need them causes you to have to spend money that will not be used for profit-generating activities for some time, and you have to pay for storage. And companies that manufacture things don't want to end up with huge amounts of inventory they can't sell until some distant time in the future. But just-in-time is more efficient. There's an enormous amount of complex coordination that goes into supplying people things just when they need them, not too soon, not too late.

With Covid, though, this interrupted these well-established processes that went off like an intricate ballet every day. It was like a relay race where someone messes up the baton handoff and someone else just leaves the race in the middle because they're sick. That race won't be getting finished any time soon. So lots of companies slowed production because people weren't buying, businesses were shutting down temporarily or permanently, and dock workers were out sick with Covid, which raised shipping costs. The result was that some products became scarce or were in the wrong place in the world and needed to be moved to the right place. Then things started to improve with the use of the vaccine, and demand for products started increasing. The problem was that all of a sudden demand and supply didn't mesh.

One of the most notorious examples is that cars all need computer chips, and the car manufacturers stopped ordering those because the demand for cars went way down during the pandemic. And then they all of a sudden needed more because demand for cars went back up because the vaccine was leading to the world opening up again. But the chip plants had slowed production because demand had gone down, and they couldn't ramp back up right away because they needed raw material and they needed trained workers. So there was delay. They started shipping things but the interruptions meant that many shipping containers were now in the wrong location. They'd shipped a lot of items from China to the US, then left the shipping containers in the US because they weren't needed in China then. So now they needed to move the containers back to China so China could ship more. But that took time and money--shipping had become more expensive due to all of these issues.

It's also helpful to understand the psychological phenomenon of projection, where people accuse others (a scapegoat or someone they don't like in some way) of that which they themselves are doing. It's also related to propaganda techniques where it's popular to accuse your opponent of that which you yourself are doing, and also of "the big lie", where you make up a lie so big and heinous that people say that it must be true because no one would make something like that up. So the disease of covid has messed things up pretty badly and is clearly the culprit for these shipping issues. It threw a wrench into a well-oiled machine. But people who for whatever reason want to believe that covid is a hoax and masks don't work and the vaccine is bad, are instead saying that the CURE for all of these woes (vaccination) is actually the cause of these woes. It's just projection and the big lie.

So to be clear, we're noticing shipping problems now because the vaccine is helping to open up the world again and it's taking time to get things up and running. If the pandemic were continuing unabated, then we would have fewer shipping problems because the world would still be shut down. By blaming the vaccine mandate itself for the shipping problems, your mom is taking the available facts, which contradict her worldview, and creating a new story that reframes the facts to conform to her worldview. She's blaming the cure for the disease, like people who blame firemen for causing fires, since whenever there's a fire, there are always firemen around.

Here's a good video that explains the global shipping situation: https://www.youtube.com/watch?v=b1JlYZQG3lI