Welcome to Justanswer! I am Dr. Altman and happy to assist you both today!
So sorry to hear Stella is having issues with constipation. If it lasts 48+ hours without a bowel movement then I would strongly urge a veterinary exam to discuss options and begin more aggressive care to get her to defecate. In the meanwhile:
1.) A high fiber food. This might include a light formula which will have a higher fiber content. This gives a dog a feeling of satiety and when the stomach is full there is an increased urgency to defecate which will help empty the colon. For now feeding more frequent so 3-4 meals daily until a bowel movement since each meal will help encourage motility of the gut.
2.) Add water to the meals which is important in defecation and motility because it aids in lubrication. You can use canned food or dry food with water added, especially since she doesn't want to drink more
3.) Regular walks. Leash walks are critical in emptying the colon completely. Especially an hour or so after meals. When the stomach is full the gi tract tends to start increased motility so there is a natural urge to defecate.
4.) Supplements along with the light formula can include white rice (reducing the diet to add this), 1 tsp canned pumpkin with meals, 1/2 tsp of miralax
If this continues despite these recommendations it would be best to see your veterinarian to ensure there is no issue with gi motility or dehydration causing the constipation to cause her distress
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