aw I have an ENFP younger sister, and I would feel hurt to hear that I hurt her.... so I think I would like to now, and personally, my first reaction would be to explain how is that my intention isn't at all to hurt... I would say that the times that I can come across like criticize her ( although I really never criticize her because my ENFP sister would feel personally attacked and she has learned to react by yelling and getting angry and saying hurtful words, so my family and I just avoid giving her criticism) but regardless, if I would come to the point of giving her constructive criticism, it is only and just only because I see so much potential in her I believe she is so so smart, so that is why I feel like I need to say something to help her out, to help her maybe change something that I feel in the long run will not benefit her, because I want to see her happy and grow as a person, that is the only reason I would "criticize" my ENFP sister, so she realize that what she is doing maybe isn't all that good and beneficial and can do better, but yeah INTJs when we feel that level of trust in someone we can be specially very very blunt.

You say you are close to her... and we INTJs say things straightforwardly when we are close to someone, so I would think you both must have a kind of relationship were you know you can bring that up to her with the same level of bluntness and talk things out. I personally, wouldn't feel annoyed... I would feel sad that I made her feel hurt, and hurt if she assumes that I have bad intentions, but idk how is your sister or how would your sister react. Hopefully you both can resolve it.