Walking and early pregnancy.

Hey guys so my sister in law is pregnant she’s 1 month and a half at least. Her first days she had spotting. She went to the doctor and it was normal. She was crying and was really scared. It happened in the morning so from then on she has been in bed the whole day. She doesn’t do anything! It’s been like this for 3 weeks. I just want to know if this is okay. I’ve heard it’s really good to be walking when you’re pregnant. She doesn’t need bed rest the doctor said she’s perfectly healthy. My mom has to go to their house to clean and cook. She doesn’t want to get up at all. I’ve never been pregnant so I have no idea if this is okay because the only reason why she’s in bed it’s not because she’s sleeping it’s because she thinks if she moves she could have a miscarriage. Please help