My partner is a normal weight, and healthy. I have another present for her that she has asked for,  nothing to do with fitness. The reasons why I want to get her a fitness tracker: 

She enjoys exercising 
She can’t find enough time to exercise so I thought this might be a good motivator
She exercises primarily for mental health purposes 

Reasons why it might be a bad idea: 

It could be insulting 
She can’t find much time to exercise at the moment so it might make her feel bad about not exercising or using it 
Might be a bad present, like giving your mother a vacuum cleaner 

Tl;dr is it a bad idea to get my normal weight and healthy partner a fitness tracker? WIBTA? 