Legal Question in Family Law in California

She is not entitled to "have" the house. But, if joint funds were used to pay for anything to do with the house, such as improvements, she may have a claim of reimbursement for half of the joint funds spent on "your" house. Whether there is an enforceable claim and for how much will depend on the details of what was spent, where the money came from and what it was spent on. You will need an attorney to sort that out in detail, unless the amounts are so small you and she can agree it's not worth spending attorneys fees on.