Joint property

The wife is a joint owner of the property along with her husband.

She is entitled to her half share in the property and in the other half of the property, as one of the legal heirs of her husband, she will be entitled for a share out of her husband's share in the property along with other legal heirs, therefore she cannot sell the entire property, she can sell only her undivided share in the property provided there is a buyer to buy her undivided share in the property.

The wife can sell her 1/2 share in the property, but for her husband's share, all the legal heirs including the wife have equal rights over the share of her husband.

There are two parts of answer to the facts posted.

Wife owns 1/2 of the property which she is entitled to dispose.

Remaining 1/2 share of deceased husband shall be inherited by all his LRs, if property is intestate. 

You are most welcome for understanding and acknowledging.