It was in the comic. When she meet Spider-man she assume he was a grown man, until she finally took off his mask to kiss him and saw he was a teenager. She became shock, then when she realize she been sensually flirting and hitting on him for mouths or a year she thew up on him and walked away without a word and was simply never seen or herd of again. As for your other question.... Yes the Marvel studio have been changing everything in the movies and series scene the Disney take over for the worst then the better. For example... Black Widow is suppose to be a hardcore Russian super spy like in Jennifer Lawrence Red Sparrow, and Overwatch Widowmaker only with nearly the same super solider power of Captain America. But in the movies there is nothing Russian about her. She vulnerable, has the typical American girl attitude, barely uses guns, and has no genetic enhance powers.