I don’t know what to do

My baby just turned 8 months. We have been having a hard week. I don’t know what to do with my baby. She cries if I’m not holding her. If we are on the bed sitting watching tv she HAS to see me and make sure I’m there. If I get up to get water or start cleaning I put her in her jumper and she cries. I take her out and I put her in the walker she cries. Finally I put her down with her brother who is a year old and she cries. This whole week I have been carrying her because if I sit her down she cries. If I’m with her playing on the floor she HAS to feel me next to her. I get up and turn my back to her she will cry. Same goes if we’re on the bed if I get up for a second to get a diaper she will cry. I have done everything I can and at the end of the day I can not always carry her. Yes I understand some moms are different and don’t mind carrying their baby all day the second they cry (which is totally fine your the mom do what you want) but I personally don’t think carrying her will help her in the long run and will just make it worse. I was washing dishes and I sat her down with her brother to playing and she comes crawling crying the whole way to the kitchen and sits down next to me and stops crying. I told my sister because I really don’t know what it could be and I just don’t know what to do. She said that she could just be attached to me but I don’t understand why or how could I help it I don’t know what to do anymore and I was hoping if some mommies are going through the same thing or have before and how I can’t help her and me with it. I spent time with my kids separately and then we always all spend time together. Like I said this just started this week.