Family Tracking App + Privacy?

My wife's going through a difficult pregnancy and wants to get a tracking app so that I can keep a remote eye on her if she e.g. passes out somewhere.

I'm very much not keen on having our data sold and lots of these apps have all kinds of intrusive features on them like reading messages and such.

Does anyone have any recommendations for apps that don't (or at least purport not to) sell your data?