Burmese kittens & cats in Ottawa, Ontario

We've had Lucky for six months, privately adopted from distant family as they could no longer keep her or their other cat (who we also took in)—when she came to us, she was severely underweight and very frightened. Since then, she's become very attached to us and appeared happy in our home. She was extremely affectionate. On July 12, however, a neighbour's outdoor cat slipped in as my partner opened our front door, which resulted in some bites from Lucky (understandable due to the chaos). However, she attacked me two more times since, including a week later as I lay in bed, and all bites were severe. She had no cues with the later two attacks and targeted me specifically. Can share more details in DMs, as I can't fit it all in the character limit. My hope is she is only aggressive with me, as she hasn't attacked my partner (and went limp when he picked her up). However, I can't have her in my house—she's isolated to one room most of the time we're home, which is upsetting for her.