Hi, I can help you with your question today.
I can understand why your wife is getting concerned, however, there are a number of different things we can look into before we determine that there is nothing else to be done!
Has Molly had anything unusual in her diet? People food, getting into the trash, etc?
OK, has she had her stool checked for intestinal parasites recently?
I would consider dropping one off at her regular vet just to screen for an easy fix.
Aside from that, you can try a couple easy things at home. How much does Molly weigh?
You can give her an OTC human probiotic like Culturelle. Break one capsule over her food each day. You can also give a dose of Imodium (2 mg loperamide). For a dog her size, I would estimate a dose of 2mg (1 capsule) every 8-12 hours.
You can also use a bland diet of boiled white rice and boiled chicken.
This is palatable and easily digested.
If these work, we can also try a joint supplement and some pain medication to help her mobility.
As long as she still has a good appetite and is behaving normally I think it is reasonable to wait 2-3 days as we try the medications.
I sure hope so! Please feel free to continue posting with updates. I will try to check on you in a few days to hear about Molly's condition.