Is it obligatory for a husband fulfilling Nafaqah to give his wife an allowance on top of necessities like food, clothing, medical care, and makeup?
Bismihi ta'ala
If your question is about the minimul wajib for the husband to do, under nafaqah, then no, he does not need to give her additional to what the wajib nafaqah is.
The financial maintenance wajib upon the husband is to pay for whatever needs the wife has, according to their status.
Yes, the husband should do that, out of his good will, for her to have savings for herself, and buy things she is interested in.