Hi, I'm Dr. Bruce. Welcome to Just Answer. I'm reviewing your question now, and will post back with a reply ASAP.
Do you feel that she's stressed at this time? Is she acting uncomfortable? Is she breathing normal?
Alright. That is good that she's comfortable. This doesn't surprise me that a beagle would do this. For the most part, this sounds like a food bloat - eating enough to fill up the stomach to maybe cause some slight discomfort. At my ER, if one comes in, I typically don't do anything for them as they should be able to digest the food and pass it on their own. If they were to start to vomit with no material being brought up or get very uncomfortable, then it could have turned into something more serious. Just eating more treats / food than normal may in some cause some diarrhea, but for the most part they will digest and pass it. I don't like to induce vomiting as there is the small chance of aspiration and this is less than other possible issues.
I'm hoping for the best for this girl! Hopefully she stays out of trouble in the future!