F-2 Visa denial twice

[akshay667]

My wife appeared for F-2 visa twice in India and her visa got refused.  First time(18th March-2019) her case refused after 20 days of administrative processing and below are the details of the interview.

She- good morning
Vo- good morning
Vo- give me your  passport
She-  gave passport and my i20
Vo- what your spouse studying in US? nd which college?
She- answered
Vo- when your husband started studying?
She: 2018,  now  he is in 2nd sem.
Vo- when did you get married?
She - 3 and half years
Vo: why are you going for US?
She-my husband starts Vacation on April so, I want to meet my husband and spend time with him.
Vo- why are you not traveled with your spouse?
She- I'm doing well paid job here so
Vo- why are you not applied for visitors visa?
She - if in case any medical emergency I can travel any time so.
Vo- returned my i20  nd VO took my passport and also retuned 221g green slip which for administrator processing.
She: thanks u sir.. when i can receive my passport.
VO - I will inform by mail.

Below are the detail for the second attempt(28th May-2019) at Delhi.

Vo- What is the address of your husband apartment?
She - told

VO - When did you get married?

She: 3 and half years back.
Vo- What do you do for living?
She: I am working in software company as web developer.

VO: Sorry, Your visa is rejected and handed 214g slip.

Note: In both interview, VO officer didn't ask for any documents except i20 of both of us, passport, and DS160. 

We are not able to figure it out where exactly where we went wrong to convince visa officer during visa interview. Currently I am on CPT and will on CPT till mid of December. My wife is planning to apply F-2 visa again in early September.

Can you please point out where exactly we made mistake or should be take care from next time?

What are the chances of getting visa for third time?