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Good afternoon. I am Dr. Beatty and I am so sorry to here about your kitty passing. What was her name? Are you wondering what could have happened to her so suddenly?
It is so hard to lose such a beloved companion. Again, I am so sorry for your loss and it is even more difficult sometimes when it is so unexpected. First, if you would like a more definitive cause of death you can ask your vet or the ER vet to have an autopsy done on her which may give you a more definite answer about what happened. If you want this done, you should take her to your clinic or the ER clinic right away and tell them you would like an autopsy. The procedure is time sensitive so do let them know if you would like this done.
It sounds like she passed away from a cardiac event and/or a blood clot from what you describe. Generally these events are very, very sudden without warning and the kitty usually dies very quickly. If it is any consolation at all, if this was the situation with your kitty there would have been very little your veterinarian could have done even if you arrived at the clinic before she passed away.
If you have any other questions or concerns please reply back to this thread. I will be happy to answer other questions you might have even after you have accepted and rated this answer. My goal is to give you excellent service. If you have other question please let me know. Dr. Beatty
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Here is a great article about sudden death in cats from a reliable site.
You're very welcome and you will be in my thoughts. Dr. Beatty