How do I get rid of the smoke smell in my house?

Ozone machines available online remove smoke and other odors

Vinegar and water

I would start with washing all the curtains and cleaning the upholstery and carpets, Cheryl. If that doesn't do it, you will have to clean all the hard surfaces - walls, ceilings, cabinets, etc.

Washing things with vinegar is a good way to get rid of the smoke smell. I don't know how long you had a house sitter and how long she was smoking in your house. You can wash down the walls and windows, clean any curtains or drapes, wash any bedding, clean the carpeting. It's a big job if you have to do everything.

It is very unfortunate that happened.

I’d open the windows and air the space out for a while. You could also try using Febreze on any cloth surfaces.

Activated Charcoal. You can buy it at fish/aquarium store or online. Put it loose in shallow pans around house 1'2"thick in pan and it will absorb odors or you can buy actual activated charcoal house/furnace,AC filters($$) Granules work best not compressed pellets bulk supplier https://envirosupply.net/landing/build-a-laser-cutter-fume-extractor/4x8-coconut-shell-activated-carbon-5-lb-bag.html