Thanks everyone for your replies. I called the MCHN and she says that it is normal and to use distraction. I must say she is very pre-occupied with it and we are trying to ignore it.

One thing I am worried about though is that she isn't walking yet (my others walked very early) and she seems to be more interested in her little habit than trying to walk. She is walking around furniture and even stands by herself. But unlike her sisters she just isn't interested!!! I guess this the part that concerns me the most