Hajj is prescribed for both men and women in Islam and is obligatory one time on anyone who is able to perform it.

If she is not able to perform hajj (because she cannot afford it, because it would cause hardship, because she is physically unable to, because she cannot get a visa, or for other reasons), then it is not obligatory right now. 

Sometimes we are not able to do things in life because of our circumstances, and this is part of life. We are not responsible for the things we cannot do. 

As the Qur'an says, Allah does not intend to burden us!

If she is not able to go, it is good for her to pray for Allah to grant her the opportunity to go in the future and to have the intention to go if it becomes possible. How often are prayers to go to hajj answered!

If her circumstances change so that she becomes able to do it, then it becomes obligatory.  

However the intent behind Islamic law is that everyone who can perform hajj does so regardless of whether they are a homemaker or not.