Yeah...not letting her do it..just wanted to know if it's due to teething or it may be related to any deficiency?

It's not hygienic, so don't let her do it. Give her some toys, teether.

Hi 
Don't let the baby kick the floor. It could cause stomach infection. Also try to give finger foods like potato boiled, paneer fries, frozen carrots, vegetable rolls.try giving teethers. 
Hope this article will be helpful. 
<a href="http://app.babychakra.com/article/1496">Teething 101: What to expect when your baby sprouts those pearly whites</a>

My baby has started licking the floor. She is teething and has got 4 teeth already. Is licking the floor normal?she doesn't mouth other objects or toys,just the floor..