How do I tell my best friend I don't want to be around ppl.

How do I tell my best friend that I love her lots but want to be left alone?

How do I tell my best friend that I would love to see you but I'm fighting postpartum depression with anxiety and would rather crawl in a ball and watch TV all day rather get up and do mommy shit.

I fighting something called postpartum depression and I don't know how to tell my family and friends give me time to come around?