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Hi, I'm Dr. Bruce. Welcome to Just Answer. I'm reviewing your question now, and will post back with a reply ASAP.
Did they do any medications for the lose stools? Did they see the plug of poop? I'm going to be honest and say that if there is liquid passing out, it would be very unlikely that there is a hard bit of stool that can't pass. Could this be the rectum prolapsing a little from all the straining? This would be a consideration I'd have. She may be one where a course of albon or metronidazole is needed to treat a bacterial overgrowth or cocccidia. Could there be giardia present as a standard fecal evaluation can easily miss this.
This is very interesting. It just goes against what seems to be the typical situation. For one so young and small, it wouldn't seem that a laxative would be a good idea. Maybe a change of diets is needed to help get the intestinal tract environment to a more motile state. The addition of probiotics may be a consideration here. I would consider doing a fecal evaluation for giardia to see if that is going on. Again, the odd thing is that I just have a hard time believing there is hard stool that can't pass when soft stool is passing around it. Can you take a picture of what you're seeing?
One of the things to consider here is to get a second opinion up close with another veterinarian if you felt the first one didn't address things fully. In a situation like this, a change of diets may be something that helps the situation.