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The mucous around the stool means there is inflammation in the colon or lower intestines.
It can be caused by a bacterial infection or a parasitic infection.
I know you dewormed her but the over the counter products are not effective against all types of worms and parasites.
It would be a good idea to have a vet checked a fecal sample to rule out abnormal bacteria and parasites. Both conditions can be treated with oral medication.
She could also food ingredient intolerance.
You could try feeding her a bland diet of plain cooked chicken and rice for a few days and see if that helps. This is a bland diet and easy to digest.
The most common food allergens are beef, lamb, poultry, corn, and wheat.
There are over the counter diets, labeled sensitive stomach, that you could try to avoid these ingredients. My own dogs eat "proplan sensitive stomach."
The only true way to determine if she has food allergies is to put her on a completely hypo allergenic diet. This is a prescription diet called "hill z/d." You have to get it from a vet. She would need to be on the prescription diet for 6 weeks.