I'm not sure about the sprinkler thing. But I know that most houses have mold. She might want to check for black mold. That was a big thing around here once and people were getting sick. Hope your mom gets to feeling better.

mold is a health hazard. i went to visit my son and daughter-in-law. they had black mold growing up the walls and all around the window sills. the landlord was a slumlord. he refused to fix anything. he was almost rude to me and told me to mind my own business if i knew what was good for me. so i told him fine, he would NOT be seeing a dime of rent until he fixed the problem. we put their stuff in storage, cleaned the apartment and they came and stayed with us until they found another place. its amazing how fast my grandson got better. he was only a month old and constantly sick. we got a letter from the landlord saying he was suing them for 2500 in damages ! from his own mold problems ! i sent him back pictures i took on the day they moved out of the moldy walls and windows and copies of the babies medical records and told him we;ll see you in court. never heard from him again. your mother needs to get out of that place until its fixed before she suffers some serious health issues.

Yep, mold can be deadly.  It is good that she is getting it checked.  I have heard not to use the sprinkler at night because of the lawn molding but not the house.....but, if the lawn can mold, i would think the house would to.