am I selfish?

I lost my daughter back in May 2017 due to NEC, she was premature. she lived for a week.. so the day of her funeral, my husband's sister comes from Mexico "supposedly" to support us etc. I honestly didn't feel it that way. She is somewhat poor in Mexico and brought her 5 year old daughter along. A week After my daughters funeral, they throw a birthday party for her daughter. I personally did not go and they begged us to go. Whatever, I ignored it and my husband stayed with me. After the party, she went back to Mexico. A month later, we find out she's pregnant. I felt so HURT. To this day, it hurts. I understand it's not the babies fault. I juat feel so hurt and jealous.. When we go visit his parents, his mom ALWAYS has to call her or FaceTime her when We go. And that bothers me. My other sister in law is always posting about her and showing me pictures and even hanging pictures of the baby in her room (she's 21) and my heart breaks Everytime I go.. It sounds selfish but it honestly hurts me so much. Idk what to do to stop feeling like that.