Try keeping her upright for about 15 mins after feeding and/or see if you can incline her mattress to relief some of the pressure on her tummy x
Some babies just have super bad reflux my little one was sick alot and now she's almost 13 weeks it is improving she's still sick after at least 2 feeds a day though. Their valves are just undeveloped
Mine does this too and she’s 7 weeks. I’m not sure if it’s normal but I’m glad to see it’s not just mine who does this 🥴