I'm so glad to hear she's doing better today. It would definitely be hard not to suspect the medication, either a side effect or that it is possibly raising her thyroid levels too high and causing hyperthyroidism. Having had collies, in my experience they can be ultra sensitive to medications and prone to reactions. I remember having to be careful what heartworm preventative I put them on because of that. I think you're right to go with your instincts and your plan sounds like a good one. I'll be keeping you and Molly in my thoughts. ((hugs)) to you.