Did I tell you I told my sister she's struggling to get pregnant because she doesn't take care of herself?
How do you think that makes her feel hearing that from her sister?
I didn't care how she may feel 'cause it's true
You shouldn't just assume things about her. You need to give her a chance to change her ways.
All I'm doing here is explaining to you why she's having trouble getting pregnant.
Instead of criticizing her, you should be guiding her towards adopting a healthier lifestyle. Suggest she consult her physician, if necessary.