I appreciate your concern,
As you said injury
is now 2 and half weeks old and she is active as well,so do not worry.
which she got in between was viral in nature which also have subsided,
The most important thing in head injuries is to do close monitoring of child at least for 24 hours,for any vomiting
,any abnormal behavior,any bleeding from ear or nose.and in case any one is noticed child should be immediately taken to ER,
Wishing your baby good health.