My husband, mother and I own a home. She wants to sell. Can she take all the money from the sale?

When you say that the three of you own the property, I assume your and your husband's names are on title.  As a result, the property cannot be sold without your signature.  If you refuse, without knowing more, partition and sale of the property is a possibility.  Again, without knowing more, I would think the proceeds would be split three ways.  If you want to get a better answer, please call to discuss.  Good luck!