<human>: Can you condense the text into three sentences or less?

As the title states my girlfriend had to put down her dog a couple of months ago. It was really sudden and he was still quite young so we weren't at all prepared for it. He was her dog but we've been together for two years and living together for one so it was hard on me too. We took him to the only emergency animal hospital in our town that's open 24/7 which is where my best friend happens to work. He was the vet that ended up helping us. We ran all kinds of tests and tried a few things to help him but ultimately put him down that night. As much as the situation sucked, I think my friend was excellent at handling everything and my girlfriend didn't seem to have any issues with him. 

For the past two months she has expressed that she thinks her dog wasn't actually sick and our friend just ran all of those tests and put him down so he could make money. I tried to be sympathetic at first but now she's straight up insulting my friend and wants me to stop hanging out with him. My buddies and I have baseball season tickets (she has one too) and every time I go she asks if the "dog murderer" is going to be there and if he's going she won't come. She whines every time I get to get together with my friends too if he's going to be there. 

Can you guys think of anything I can do to get this to stop? I think it's really disrespectful and I'm probably going to break up with her if it continues.
<bot>: my friend is the vet that put down our dog and my girlfriend thinks he ran all these tests and put him down just to make money.