Step mom troubles

I’ve been married for 1 year this month. My husband is 12 years older then I am and I’m 26. My step daughter is 16 and my step son is 14. My step son and I get along great! He comes and talks to me and wants to spend time with me. My step daughter is a completely different story. If I’m around she stays in her room, she doesn’t talk to me. If I try and talk to her she either ignores me or just shrugs her shoulders. We use to get along good, laughing and talking especially after I spoke with her and let her know I wasn’t trying to take her Moms place, I just wanted to be someone she could talk to and I wanted her to know that I love her. I spoke with my husband about her being distant and he asked her what was going on. She said she was jealous of me and that she wanted to spend time with her Daddy. I understand that and I try and still let the kids have their alone time with their Dad. But she stays in her room almost the entire time she is with us. My husband told her that if she wanted time with him all she had to do was ask and to try coming out of her room every once in a while. I’m heartbroken, I want so much for both my kids to be happy, and this hurts so much that she doesn’t want to be around me. I’ve tried giving her her space and going to her and trying to take an interest and talk to her, but she just won’t. I’m so discouraged. What do I do?