There are so many different watches I'm not sure what to get but I am leaning towards the Watch 4 or Active 2. I see these on my local Facebook all the time fairly reasonable.
I bought her a Galaxy Watch 4 but she doesn’t seem to be able to use some of the features. For example on the watch the ecg option, it says to download Samsung Health Monitor but I don’t see a way to do that. She has a Pixel 6a