u/IHATEMYSELF134

Hey guys! I love the elements of chemistry trilogy from penny reid's hypothesis series and i have a few questions to ask

I noticed that the last few books in the series are of kaitlyn's best friend SAM. I am not particularly interested in her series but i read that kaitlyn was mentioned a lot in the Sam's series, and that kaitlyn was hospitalized for a illness

Can someone please spoil the storyline for me? What was kaitlyn's illness and does she get cured? Is she happily married and is her relationship with Martin going on well? Do Martin and kaitlyn get their HEA? Please tell me that kaitlyn isn't dying

Also, do they have kids? Please spoil as much as you can about kaitlyn and Martin, and their storyline in the series after the trilogy