Go to your office. There appears randomly a message about spiders inside of it (if you don't get that message just reenter it until you'll receive it). Choose then the option "let it bite" and visit Gwen in the Spiderverse after that.
What if we squish it without knowing it's for Gwen? Are we able to get the message again or have to restart to get her?
I think so, but it's been a while since I've played it tbh...
