My girl friend and I have A house togeather if I want to sell what do I have to do if she does not
If you, both are on title to the house, unless you both agree to sell, it may be necessary to file a court action known as a partition. This can be a lengthy and costly process. Although you do not mention it, there may also be mortgage issues.
File a case in the circuit court for partition of the property (quite expensive)or agree to have girl friend buy out your interest.