I've got to intimidate http://elderscrolls.wikia.com/wiki/Carlotta_Valentia
but I'm not able to understood what I should do.

If I step into his house during the night and I attack her she will just call the guards. Everytime I attack her I commit a crime, no matter what.

So what am I doing wrong ?

She has a market stale and also goes to the banner mare tavern during the night. Go there and talk to her.

As said above. Just talk to her.

Thanks a lot. Thought there was a button that I was missing to intimidate people.