Oh no. I'm so sorry. I've had an escapee get into a tight space. It's not fun and especially not considering your deadline
Maybe try asking the pet store for some dirty gerbil bedding to bait your hide. I've heard people refer to them as snake crack and when i worked at a petstore and had a non eating hatchling a good 8 times out of 10 scenting with dirty gerbil bedding got them to eat. Not sure why snakes like gerbils so much but maybe the smell of an extra yummy treat will entice her out.
Oh maybe try getting a red bulb work light to check out the area late at night. I tried using a regular flashlight and my escapee girl would tuck back into her hiding spot whenever I shined it near her.
Good luck