The way I got rid of ants that where everywhere, bedrooms, living room and worst in the kitchen was with a vacuum cleaner. I used just the nozzle. Whenever I saw an ant in the kitchen I vacuumed it up. Now once the room appears empty I just sat there and stared. Often as got distracted and turned my head for an instant and when I looked back there was an ant in the middle of the floor. I saw ants coming from crack in the baseboard but that was just a small cave. Eventually I saw that the only place new ant where coming from was through the living room door. I did the same thing in the living room and found they where coming through the door to the porch. I did the same thing in the porch and fond they where coming up through a short cold air duct to the basement . I found that they where coming through a crack in the basement window. I sealed that with duct tape and her problem was solved. Ps there where still a few more ants they were probably in various crevasses. She happened leave an unwashed class with a bit of coke in it on the table the next day there were 7 ants stuck to the coke. After that she intentionally left a unwashed coke class and caught 2 more ants. Since then her house has been ant free. This only took about four hours to do and most of the time we spent sitting there and drinking coffee while we waited to see where the ants were coming from.