Well, it is not terribly surprising that such a high number of homeless women are homeless due to abuse. In that study (at that site) it says: physical or sexual abuse. So maybe another 8% (which would amount to 100%) fall into the category of other forms of abuse (not physical or sexual).
Many families who are homeless are homeless due to domestic violence
There goes that fallacy that homelessness is caused by lack of a will to work or being irresponsible w/ $$ and etc..