My (32F) sister's (28F) behaviour towards my husband (33M) is horrendous

I’m having a hard time figuring out what to do. My sister (28F) has been over at my place (32F) for the past 3 weeks. I love my sister and want to help her in her difficult times but I also don’t want her behavior to turn my husband (33M) against her. <br>My sister went through a tough breakup a year ago and has been staying with our parents since then. She was doing fine until our dad passed away suddenly 3 months ago. After that my sister started having a hard time dealing with her emotions. She’s been very vocal about not wanting help and hating to be touched. She would just break down and cry for hours at a time and that worried my mom so much that she asked if my sister could come stay with me. <br>My husband and I have a 2 bedroom apartment and we let my sister stay in the spare room. She doesn’t go home and my husband works from home so my sister is around him 24/7. <br>The first week she stayed here my husband was very patient and understanding. He would check on her throughout the day and offered to make her a cup of tea or coffee. She would always decline and he didn’t push it. <br>In the second week my husband and I both noticed a change in my sister. It seemed as if something in her had cracked and she began lashing out at us for everything. Tbh I was upset when she snapped at me but I understood that she was in a lot of pain and I wanted to help her. My husband however was not too happy. <br>I don’t know if it’s my fault or not but whenever my husband is around my sister she just goes off on him about the smallest things. And when he tries to apologize she twists his words and goes off on him more. <br>Like yesterday my husband made a pot of coffee and said “Anyone want some coffee?”. My sister exploded at him saying he was being condescending and talking to her like a kid. My husband apologized profusely and even made her a cup but she threw it on the floor and started crying. <br>I couldn’t take it anymore and talked to my husband about it. He was very calm and told me he’d continue to be patient. <br>However I don’t think this can last for much longer. <br>My sister has agreed to therapy but wants to stay with us for the time being. How long should I let her stay?