mamas w dogs..

I need some help.

I have a shihtzu who is usually very chill and is never a problem.. till recently. I think she's becoming more aware that her sister is coming soon, and she's been going nuts! she's super over protective of me now, and even the tiniest little noise triggers her. I try to calm her down, but she'll keep barking until whenever she's done 🤦🏽‍♀️ I'm nervous this will continue or get worse once the baby's here and she'll wake her up and I'll get mad at the dog :(

any advice on how to calm her down or anything? I'm desperate lol.