What should I respond?

I ordered a dress to my coworker’s address. In order to pick it up on Friday, she needs to let her roommate know and get the key to the mailbox. Instead of doing it right away, she wrote: “Remind me next week.”
It seems a little strange to me that an adult person doesn’t just set a reminder and asks me to do it instead. On the other hand, it’s a small thing.
My question is: how can I politely tell her that she should handle it herself without offending her? Or should I just remind her and not overthink it?