My boss scheduled me to be shadowed after I had some missteps and told her I was overwhelmed. It’s for 3 hours but I’m worried I won’t have enough work to do and I’m not sure what to do to keep busy. Any advice?

I’m trying to come up with things to do but I’m blanking. Anything I could do like get paperwork done isn’t relevant to my job. My job is to answer emails and input things emailed to me in a system and I’m lucky if in my 3 hour shadowing I get 10 emails and 1 order.