It is all possible for babies to start teething early.
Since your baby is young, it would be helpful to start cleaning her gum with cool boiled water and a cloth around your finger so that she will be able to accept the idea of teeth brushing as more teeth sprout.
If your kid is not in great pain, you can just leave her be and the teeth will sprout in a while. If she's in pain, you could use Dentinox teething gel. It's an L.A.. It numbs the gums for about twenty minutes. Usually used just before feeding or just before sleeping for the pain to be soothed so that they can continue doing those normal activities.
If the white spot feels hard, most likely it is a tooth sprouting. If it's not hard, it could be other things like fungus growth or even an ulcer.