Hello and welcome to Healthcare Magic. Thanks for your query.
From the description of your daughter's symptoms it appears that she may have developed a hematoma
(a localized collection of clotted blood) due to the injury
. Usually, after a few days, the clotted blood in the hematoma will start getting liquefied and gradually re-absorbed. This must be the reason why you are feeling a fluidy consistency after a few days. Don't worry about this, as in the next few days, the blood will get reabsorbed and the swelling will gradually disappear. Secondly, normally, there will be some irregularities in the surface of the skull. This is what you must be feeling as tghe rough surfaces on palpation. This again, is nothing to worry about.
Wish you all the best.
Dr. Jonas Sundarakumar