Visitor Visa - B2

Dear Friends,

Today my wife's B2 visa got rejected.
I m having valid B1 visa and 7 months back I was in US for almost 3 months.
Apart from I hold L1 and my wife L2 visa from the previous company.
My wife is a homemaker.

Could not understand the reason why her visa got rejected as the interview was easy and went well with simple questions below:

Consulate: Good Morning.
 My Wife: Good Morning

Consulate: Please give me your passport
My Wife: Gave my passport to her.

Q1. What is the purpose of your visit?
Ans. would like to go to US for tourism n pleasure

Q2. What does your husband do?
Ans . my wife has answered my company name and designation.

Q3. You will be traveling with your husband?
Ans. Yes

Q4. How long you have been married?
Ans. 6year and 7 months madam.

Q5. Do you have children?
Ans No Mam

Q6. Do you work?
Ans. No

Q7. Does your husband holds valid B1 Visa
Ans. Yes

Q8. How long would you stay in US?
Ans. 2 weeks

These were the above questions asked and replied accordingly.
Consulate said sorry your Visa got denied and then she handed me my passport and one Form 214(b).

Please advise what went wrong?

Thanks!