I currently live with my partner and his parents. We have 3 cats total. There are 2 that live in the house with all of us and 1 that lives in a workshop in the garage. We used to have 2 out there but one of them had to be put down because of heart failure or something. Ever since he died, the other cat has been seemingly depressed. She meows a lot more and seems slightly distressed. She and her late companion used to be barn cats (not sure if that important). She use to be very cuddly and affectionate. My partner's stepdad doesn't spend a ton of time in the workshop with her. I'd say she's alone 20 hours a day. Recently, she has started attacking us. It started with me. I had some wood working to do in the workshop so I went in there. She kept clinging to me and interfering with what I was doing and when I tried to move her, she lunged at me and scratched me up badly on my leg. I haven't been able to go in there since. Whenever I approach the door and she notices it's me, she will start meowing/yowling loudly and lunging at the door. At first, she was only mad when I went in there but now, she is attacking my partner. She still seems to be okay with his stepdad however. I think I know what's going on here but I'd like more advice on how to help her/fix this situation. I told my partner's stepdad what was going on with her and he witnessed an attack himself yet he seems to think its funny and that nothing is wrong. What should we do?