Flu Concerns

So my MIL babysits my LO for 5 hrs while I’m at work. Her son got the flu last Sunday (1/19) so my sister watched my baby for me during the week while my brother in law got better. I just got word that he is better and my MIL has disinfected her house and is ready to take care of my LO. I honestly don’t feel comfortable taking her just yet. I want to give it another week to assure me the bug is no longer lingering in her home. I know for a fact my BIL spent the whole week playing video games in their living room. My LO spends most of her time in the living room with my MIL and I’m terrified my LO getting sick. My hubby thinks it’s okay to take her starting Monday. I expressed my concerns and how I wanted to wait and he is completely fine with my decision. My sis is okay with watching her another week but i know she has things to do and would have to change her work schedule again. i hate to have her do all that switching again. Do y’all think it would be okay to take her to my MIL on Monday or still wait another week?