The smoke particles can remain on clothing, hair, furniture, so I'd be a little apprehensive. Especially with her recent health issues and her being so little. Do they smoke thru-out the house or just in one room? Hopefully it'll be a nice day and you can keep her outside -- maybe bring along a porta-crib and place a mosquito netting over it to keep bugs out.
Last year we went to someone's house to pick-up our new basset hound and while the people had cleaned their house from top to bottom and it was a nice day with open windows. I still had to shower to wash my hair and throw my clothes in the wash because they stunk like smoke.