GBB escaped, what to do?

So I just got back from vacation and the person who was taking care of my spiders told me one of them had escaped. A week and a half ago. There's a little hole in the wall where the heater is and he said he saw her run in there. He put the enclosure in a bag and taped the bag over the hole, hoping he would catch her. It's a gbb, maybe 4cm dls. I tried to see anything in there but the hole is pretty small. Is there anything I can do at this point to get her back? Or just kinda wait and see if she comes out on her own?