Was this a bit insensitive?

my gf had one of her cats killed. Her family moved in with her 2 months ago.. they dont like me... but they also dont like the cats, so they basically either force the cats to be either outside or in her room. This cat was not used to being outside, and so he got hit by a car. NO SURPIRSE THERE.... For the two years that i have dated this woman i have made sure that the cats are always indoor, specifically because of this. But now i am not even sure i am even welcomed in that house, as her family moving in has changed the dynamic of the situation.. they don't like the fact i am agnostic, they are all evangelicals. So when my gf texts em that her cat got killed, I said i was very sorry .. but when she told me how.. I FLEW OFF THE HANDLE..... specifically because i LOVED this cat.. he was an amazing cat with awesome personality, and was only 5 years old... I basically said.. why couldn't it have been one of the other cats...... on i didn't like so much, ...... she then flipped out... and said to leave her alone...!! this was all over text... ..... .. DOES SHE NOT UNDERSTAND THAT HER FAMILY is partially responsible for this cat being dead... they didint even have the guts to tell her face to face.. they just called her..!!!! And now she has the gaul to be mad at me!!!