yes there is a good chance your wife would be refused a visit visa, because the embassy would probably say they don't believe your wife will return to the Phils before her visa expires.
also she has applied for the wrong visa, it should be a settlement visa, if your married, why is she only intending to visit you ?
if your receiving disability benefit you could be excluded from the financial requirement but you still need to have funds to support your wife, so she wouldn't not need recourse to public funds.