Sister mad at me over seeing baby

My sister is flying in for a week and a half to see the family and eventually come and visit me and my newborn baby. I asked her to wait a few days just to make sure she isn’t feeling sick or showing any symptoms first and now she’s incredibly pissed at me and not responding to my messages. She also is going around to my family talking about me now and I just don’t see how I did anything out of line? Does me asking her to wait seem unfair to y’all? I just want to be cautious since my baby will only be 3 weeks old when she flies home. I feel like she’s being incredibly immature and selfish about this. And this is the second time we’ve discussed this and she’s gotten mad.