I'm not sure whether you are asking how to get your personal property that is in the home, or whether you are asking how to get compensated for a wrong you feel your sister did, by not giving you part of the sales proceeds.
Since the house is sold, I recommend that you immediately contact a real estate attorney for help, in either situation. The longer you wait, the less time you'll have to resolve the issues.
The above is not intended to be legal advice, but may be used for general information. Please contact an attorney for specific help tailored to your needs. www.figgardenlaw.com