Bruce's little sister (Loki love story)

Brianna Banner is Bruce's little sister. Brianna has a huge crush on Loki. She knows that he's evil but she can tell that he's trying to be good. She has the ability to transform into any animal but not being normal size animals but 3 times the normal size. She just found out about her powers after Loki destroyed New York. She hasn't told anyone about it except for Bruce obviously and she hasn't told anyone about her crush on Loki except for Steve. What would happen Steve accidentally told Tony and Natasha about her crush? What would happen if everyone knew she had powers but she didn't know that they knew already?