No - at only three, don't worry about it! Children that young don't have much real concept of numbers, and even when parents claim they can 'count' to twenty (or whatever) it is only reciting a series of words, without much 'numerical' understanding.
Start with small numerals, and encourage one-to-one correspondence - so, she can have a dolls' tea party with - say - three dolls. Ask her how many biscuits/cakes she needs, and she can lay out plates etc for each doll.
If she copes with 3 OK, gradually increase it to higher numbers. And start to bring in 'one more', 'two more' etc, but stay within her ability and understanding.
If that is OK, gradually introduce subtraction: so, pretend one doll feels poorly, and doesn't want to eat; how many cakes will be left over. Eventually, move on to 'half', 'quarter' etc, but only when she is secure on previous stages.
You are right: it is hieroglyphics to her, and is as difficult as Chinese or Arabic would seem to you.
If she has a white board and pen, or paper and thick felt tip gradually let her shape numerals (and letters too, when she is ready), or write in dry sand or flour on a shallow tray. BUT - keep it FUN, and NOT work.