This could be a medical emergency for sure. If she ruptures her bladder she can end up with peritonitis infection in her abdomen. I do know of dogs who have held their urine 36 hours but your dog sounds pretty ill and I'd be concerned if the dog goes more than 12-124 hours.

Deramaxx can cause liver and kidney issues as well as intestinal bleeding.

If your dog has gums or tongue that look white, blue, gray or yellow tinted where they are normally pink, has a slow color refill if you press on a pink area of gum or tongue, or is becoming more lethargic and non responsive to you as time goes on then you may want to get the dog in to see an emergency vet if one is available in your area.

This site may help you locate one if you need one

http://www.vetlocator.com/hotline.php

If you need financial help I'll list some groups below but if you can qualify for care credit (see list) you can usually get immediate vet care

here are some groups that might help you afford the vet bills:

American Animal Hospital Association
http://www.aahahelpingpets.org/
" Through the AAHA Helping Pets Fund, veterinary care is possible for sick or injured pets even if they have been abandoned or if their owner is experiencing financial hardship."

Angels 4 Animals
http://www.angels4animals.org/
"Our services range from financial aid to complete treatment
to those pets and pet owners in need."

Care Credit
http://www.carecredit.com/
A credit card company for health care, including veterinary care.
"With a comprehensive range of plan options, for
treatment or procedure fees from $1 to over $25,000, we offer a plan
and a low monthly payment to fit comfortably into almost every
budget."

God's Creatures Ministry
http://www.all-creatures.org/gcm/help-cf.html
"This fund helps pay for veterinarian bills for those who need help."

Help-A-Pet
http://www.help-a-pet.org/home.html http://www.help-a-pet.org/
"Our efforts focus on serving the elderly, the disabled, and the
working poor."

IMOM
http://www.imom.org/
"We are dedicated to insure that no
companion animal has to be euthanized simply because their caretaker
is financially challenged."

The Pet Fund
http://thepetfund.com/
"The Pet Fund is a registered 501(c)3 nonprofit association that
provides financial assistance to owners of domestic animals who need
urgent veterinary care."

United Animal Nations
http://www.uan.org/lifeline/index.html
"The m ission of LifeLine is to help homeless or recently rescued
animals suffering from life-threatening conditions that require
specific and immediate emergency veterinary care. We strive to serve
Good Samaritans and rescue groups who take in sick or injured
animals. In certain cases, LifeLine can also assist senior citizens
and low-income families pay for immediate emergency veterinary care." They also keep a list of local and national help resources here
http://www.uan.org/index.cfm?navid=163