Will my sister's Hajj and supplications be accepted if she performs Hajj with money obtained by our father through food adulteration, while she is aware of that?

If a father's entire wealth comes from unlawful sources, then it is not permissible to accept anything from him, neither for Hajj nor for anything else. This is because unlawful wealth is not legitimately owned by the one who possesses it, and he must dispose of it by spending it on public welfare. As for someone who performs Hajj with unlawful money, their Hajj is valid according to the majority of scholars, though they incur sin for dealing with unlawful wealth.