In most litvish circles if the girl has a job which makes enough money to cover the cost of living, that is sufficient. Also if she is in school for something which could cover the cost of living it is reasonable to assume you would only be asked to contribute until she starts working. Also if she has been working and has savings that can count also.
Finally, if you look beyond typical yeshivish families you might be able to find a serious ben torah who is prepared to move to an out of town kollel, which pays nicely, or family that might contribute to support.