I'll go ahead and give you information on constipation but if she had loose bowels at one point, then the food might have moved through her system pretty fast then and it will take few days for her to start defecating again normally.
Be sure and read the important note below before trying any of these methods. A one time use of a spoon of mineral oil on his food can be used but should not be used all the time. Since she isnt' eating, this might be difficult to achieve.
There are two methods I use for young puppies, which may work on your dog. It has never failed me to get any of my dogs large or small to go even when I didn't want them to and was just checking their temperature. I first try lubricating a rectal thermometer and take the puppies temperature. This frequently stimulates the puppy into going and it works for adult dogs as well.. If this fails and you have a nasal bulb syringe (aspirator), you can put warm water in it and gently squeeze a small amount into the rectum and see if this doesn't help.
You can use a children’s glycerin suppository depending on the size of your dog but the other methods are what I recommend you try first. If it is a smaller dog try an infant suppository instead.
IMPORTANT NOTE If your dog ate a non-food item, bone or rawhide recently or if your dog is experiencing other symptoms such as vomiting, not eating or drinking, severe abdominal pain, the dog needs to see a vet and not treatment for constipation. Dogs will often skip a meal when constipated so look for other symptoms as well. The above signs could indicate an intestinal obstruction, which you can read about here:
if your dog becomes dehydrated. You can tell by pulling up the skin between his shoulder blades and seeing if it flows back down normally. If it stays tented or is slow to return to normal, your dog is dehydrated and needs fluids immediately and should see a vet as soon as possible.
If gums and tongue become pale and not a normal pink color or the rectal temperature is over 103F (101-102F is normal) or your dog becomes lethargic and non-responsive, your dog should also see a vet as soon as possible.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.