Yes, and if Evelyn's body was truly hidden in with MB's belongings, I think it would mean that MB brought Evelyn's body to the shed at a different time than when her belongings arrived. (Unless the trailer was furnished and all the furnishings were left behind.) Then I think she could handle what she brought with her on her own.
Because, if MB had a bed, dressers, living room furniture, boxes of stuff, etc, she would need help moving all that. She'd need someone with a truck, I would think. Is there anyone who would hide the body of their baby in with their possessions and then have someone pack up those things... transport them... and then unpack them again? That seems unlikely to me.
Then, too... maybe the furniture was given to her and she just left it all behind and only grabbed what would fit into a car... clothing, toiletries, and the like. She was going to have to move in with someone, somewhere... so maybe she thought she'd travel light as there would already be furniture wherever she landed. After all, she did leave the baby stroller behind...
Just thinking of the logistics of it all and whether she had any possessions at all... (other than her deceased baby) stored in the shed. But, I can also see her, from what very little I know of her, hiding Evelyn away with her stored possessions, as others have said.
MB seems to be a "shortest distance between two points ~or~ if 5 minutes of effort will do as bare necessity... why bother adding any extras" kind of person. JMO