This could be the start of a good story, but it would need a lot of TLC - or blood, sweat and tears, whichever you prefer - first.
A few things that stood out at me:
Your MC. You spell her name both as Liza and Lisa. Choose one spelling and use that consistently throughout the story.
Your verbs. I think you may have been using some artistic license there. Setting should be sitting (you did that a couple of times) and hollowing certainly should have been hollering. Raising should be rising. There might be more.
The cats. Just get them out of there. Cats don't like scenes and would have been long gone by the time Robert trips over them.
Now for the strangling bit. Having been both on the giving and receiving end of some strangulation quite a few times, what you wrote didn't ring true to me. I cannot imagine your MC having been capable of any speech. Not even a whisper. Not if Robert did even a half decent job strangling her. If you want us to believe Liza was damn near dying, the only sound she could have made would have been a hoarse, constricted little cough. Or a wheezing sound perhaps. She might have had those thoughts, though.
Now there's the hard bit. I haven't seen anything we haven't already read or seen a hundred times before. You need to come up with something fresh or your reader will put your story aside.